Valencia coach Juan Antonio Pizzi said the La Liga club's prolonged sale may continue, despite a Saturday deadline for interested buyers.
The UEFA Europa League semi-finalists head into their league final against Celta Vigo on Saturday knowing a win could see them finish as high as eighth in the table.
However, what they don't know is whether the club will get new owners on the day, and Pizzi said the club may not have a new commander at week's end.
"In what little experience I have of proceedings similar to this, I know that they always end up dragging out longer than expected, because there's always unforeseen problems that can crop up, or need clarification," Pizzi said.
"Whilst it's true that the deadline of Saturday is there, you can't rule out that it may be extended further."
Despite being assured of a top-10 finish in the Spanish top flight, Pizzi said the club has underachieved this season.
"We have plenty of things to improve, at a personal level and for the history of the club," Pizzi said.
"Valencia should finish much higher in La Liga than we have this season.
"We've been close to playing in a European final, but our aspirations should be greater, in accordance with what Valencia has always been in Spanish and European football."
Pizzi took over from Miroslav Djukic over the New Year period, taking charge of his first game at the club on January 4 against Levante.
The 45-year-old was not looking for excuses but said his men would be better for their experiences heading into the 2014-15 season.
"Rather than blame any shortcomings, the reality is that we arrived in a complicated situation, halfway through the season and in a difficult position, competing in three competitions and knowing that if we achieved the intended results, there'd be little time for recovery," Pizzi said.
"There would be hard work amidst high demands.
"In the Copa del Rey we fell by the wayside early on but in the Europa League we kept going for much of the season, which has been exhausting both mentally and physically.
"We've also suffered injuries in important positions. Amidst such a large number of injuries, we've lost three or four central defenders, so we've had to ask players to adapt. Throughout this maelstrom, we've been trying to get the best results we could.
"In La Liga, we haven't reached the heights we expected to, but in the Europa League, we were just one minute away from competing in the final. We've been self-critical of ourselves and we'll prepare ourselves well ahead of next season."
for E. Vargas 66'
for Jonas 84'
for S. Feghouli 90'
|Icardi destined for the top - Mancini|
|Eredivisie Review: Depay inspires 10-man PSV, wins for Heracles and Utrecht|
|Simeone applauds Atletico´s response to European exit|
|Ligue 1 Review: PSG hit Lille for six, Bastia late show stuns Evian|
|Inter 2 Roma 1: Late Icardi strike puts Juve on brink of title|
|Bundesliga Review: Bayern all but champions, Hamburg claim long-awaited win|
|Guardiola focusing elsewhere with Bundesliga almost secure|
|Pellegrini salutes City spirit in Villa win|
|Inzaghi apologies to Milan fans after Udinese defeat|
|Matuidi hails PSG´s best|
|Sherwood lambasts Benteke decision as Villa miss out in late drama|
|League Two Review: Tranmere and Cheltenham lose League status, Shrewsbury promoted|
|Dyche bemoans ´cruel´ defeat|
|Manchester City 3 Aston Villa 2: Fernandinho concludes Etihad drama in City´s favour|
|League One Review: Colchester take survival battle to last day with victory|
|Pardew questions refereeing decisions|
|Bayern Munich 1 Hertha Berlin 0: Schweinsteiger strike all but seals title|
|Ramsey slams referee Jones after disallowed goal|
|Luis Enrique not looking towards title yet|
|Pearson: The win is all that matters|
|Bruce hails improved Hull display|
|Pulis hails ´great point´ for resilient West Brom|
|Udinese 2 Milan 1: Disappointing visitors´ European hopes dented|
|Atletico Madrid 3 Elche 0: Griezmann nets brace as Champions respond to European exit|
|Allardyce laments lack of squad depth|
|Advocaat still confident of survival|
|No loss of belief at Liverpool, insists Rodgers|
|Carver rues ´mad five minutes´|
|Hughes rues Stoke´s missed opportunities|
|Scottish Premiership Review: Aberdeen secure second as St Mirren fight on|
|Championship Review: Watford promoted as Fulham beat Boro|
|Monk revels in new points record|
|Klopp positive ahead of Bayern battle|
|Paris Saint-Germain 6 Lille 1: Lavezzi nets hat-trick as Blanc´s men go top|
|Newcastle United 2 Swansea City 3: Carver´s men continue worrying slide|
|Crystal Palace 0 Hull City 2: N´Doye at the double to give Bruce´s men vital win|
|Watford seal promotion to the Premier League|
|Stoke City 1 Sunderland 1: Adam strike piles pressure on Advocaat|
|Burnley 0 Leicester City 1: Vardy punishes Taylor´s penalty miss|
|West Brom 0 Liverpool 0: Landmark Gerrard appearance ends goalless|
|QPR 0 West Ham 0: Strugglers rue saved Austin penalty|
|Espanyol 0 Barcelona 2: Messi, Suarez and Neymar star for 10-man visitors|
|Koeman rues missed chances|
|Borussia Dortmund 2 Eintracht Frankfurt 0: Aubameyang inspires Klopp´s men|
|Pochettino thanks Spurs supporters|
|Fellaini contemplated leaving Man United|
|Southampton 2 Tottenham 2: Point for Pochettino on St Mary´s return|
|Ankle surgery ends Routledge´s season|
|Lopetegui hoping for Porto reaction|
|A-League Review: Glory end on a high, Adelaide hammer City|
|Howedes ´concerned´ by Schalke form|
|Ancelotti hopeful on injured trio´s fitness|
|Bernabeu return a possibility for Pogba|
|Marseille in crisis, claims Bielsa|
|Van Gaal tips Giggs as his successor|
|De Gea the boss in contract talks - Van Gaal|
|Mourinho hits out at Wenger|
|Shaqiri not going anywhere - Mancini|
|MLS Review: Goalkeeping blunder sees Chicago burn NYC|
|Ancelotti confident in Real´s chances|
|No Messi, no Barca claims ex-Bayern ´keeper Pfaff|
|Hamilton Academical 2 Motherwell 0: Canning gets first win as player-manager|
|Sporting Braga 1 Belenenses 1: Hosts´ slim Champions League hopes hang by a thread|
|Mainz 2 Schalke 0: Bell brace increases Di Matteo pressure|
|Cordoba 0 Athletic Bilbao 1: Benat sinks strugglers|
|Marseille 3 Lorient 5: Late collapse gives hosts fourth loss in a row|
|ADO Den Haag 1 Vitesse 0: Late Kramer effort ends visitors´ unbeaten run|
|Torino v Juventus: Glik aiming to deny runaway leaders and thrill Italy|
|Sevilla´s Monchi wary of Fiorentina threat|
|Dinamo face UEFA FFP sanctions|
|Cocu tight-lipped on rumours of Depay talks with United|
|Burnley too prudent in transfer market - Hyde|
|Everton v Manchester United: Evans return boosts Van Gaal´s men|
|Benitez refusing to underestimate Dnipro|
|Pellegrini insists Toure happy at City as Mancini talks up Inter move|
|Van Gaal quiet on Depay speculation|
|Thohir wants to build ´great Inter side´ - Mancini|
|Championship Preview: Watford on the brink of promotion|
|Rafael adds to United´s defensive woes|
|Motta to make PSG return against Lille|
|Pulis relishing underdogs tag|
|Odemwingie set for Stoke return|
|Sevilla defender Pareja facing long lay-off|
|League Two Preview: Shrewsbury eye promotion against relegation-threatened Cheltenham|
|League One Preview: Big weekend at both ends of the table|
|Celta Vigo v Real Madrid: Ancelotti´s men hunting down Barca|
|Hazard not interested in Chelsea exit - Mourinho|
|Arsenal v Chelsea: Mourinho not focusing on record over Wenger|
|Johnson will decide if he travels to Stoke - Advocaat|
|Silva fit to face Villa|
|Luis Enrique welcomes ´special´ Guardiola reunion|
|Brisbane Roar 2 Newcastle Jets 1: Jackson nets late winner|
|Mourinho not concerned with reception facing Fabregas|
|Relegation-threatened Rotherham docked three points|
|Nedved eyeing history after Juve draw Real|
|Johnson not suspended by Sunderland despite underage sex charges|
|Butragueno hopes to have Real stars back for Juve semi|
|Breitner expecting tough tussle with Barca|
|Guardiola to make Barca return with Bayern|
|Sevilla face Fiorentina in Europa League semi|
|Inter owner Thohir fuels Toure speculation|
|PFA guarded on Johnson support|
|Hull have provisions for relegation - Bruce|
|Martinez hails Lukaku resurgence|
|Penalty decision ´not clear´ - Villas-Boas|
|Federici opens up on FA Cup blunder|
|Raffael hails Favre´s influence|
|Serie A Preview: Inter still fighting for European spot|
|Montella keen to avoid Napoli in Europa League semis|
|Pardew wants at least £40million for Bolasie|
|Ramsey: I´m the man for QPR|
|Benitez undecided on Napoli future|
|Cheberyachko stunned by Dnipro´s progress|
|Hecking laments first-leg arrogance|
|Gomez: Europa League will make up for Coppa Italia disappointment|
|Emery ´had faith´ Sevilla would progress|