Gareth Bale is "nowhere near" his peak level of fitness, according to Wales manager Chris Coleman.
The Real Madrid man made a cameo in his country's 3-0 defeat to Serbia on Tuesday, his first competitive appearance of the season.
Injuries and an ongoing transfer saga meant Bale featured in just 45 minutes of pre-season for Tottenham, and none of their competition fixtures once their campaign had started.
And with Bale potentially eyeing a debut for the La Liga giants against Villarreal on Saturday, his international boss is sceptical about his ability to perform at his maximum potential.
"He played 30 minutes but after 15 minutes he looked tired - but he has only had four training sessions, so you will not get what you normally get," Coleman said.
"If he starts Saturday he will not finish the game, I would be amazed if he does.
"He is nowhere near ready for 90 minutes even if Spanish football is slower.
"He may get 45 minutes, I don't know, but he will feel better in himself after 30 minutes."
Bale was introduced into the match at the Cardiff City Stadium after Serbia had scored their third goal and the game had been put to rest.
However, the attacker did pose a threat to the visitors, and Coleman hailed his positive impact on the game, and the fans.
"He gave us a lift," the 43-year-old added. "The fans were excited and it gave us a spur, although the game was done and dusted.
"We needed to be in the game, it was lost by then, but it was nice for the Welsh supporters to see him."
|Brighton and Hove Albion 2 Stoke City 2: Gross, Izquierdo extend home unbeaten run|
|Rose in contention to face Dortmund as Pochettino denies ´issue´ with defender|
|Benzema knows he can give more – Zidane|
|I´ve fulfilled my dreams already – Klopp has no plans to coach Barcelona|
|Aubameyang will face Tottenham, Bosz confirms|
|Klopp expects Matip to face Chelsea, Lallana return getting ´nearer´|
|Berizzo looking to former Red Aspas to provide lessons for Sevilla|
|Mangala ready to pounce, but realistic on Man City playing time|
|Mendy injury means Aguero or Jesus for Guardiola|
|Guardiola sends ´big hug´ to ´amazing, so gentle´ Pulis|
|Tavecchio quits as head of FIGC, claims board have refused to resign|
|Benedetto facing Argentina World Cup KO with cruciate injury|
|Shape up! Heynckes reveals demand to Bayern star Vidal|
|Ramos sits out Madrid trip to APOEL|
|West Brom sack Pulis after wretched run|
|Lloris wants Spurs to forget title and focus on top four|
|Pogba no Gerrard yet, says Benitez|
|Guardiola will ´kill´ City stars if they get complacent|
|Ibrahimovic: My injury was worse than people know|
|Icardi like a ´raptor pouncing on its prey´, says Spalletti|
|City style suits me and thrills neutrals, says De Bruyne|
|Guardiola ready to risk Kompany for Man City after Stones´ injury|
|Stones can bounce back stronger - Kompany|
|In-form Chelsea have regained hunger - Conte|
|Inter 2 Atalanta 0: Icardi brace sends Spalletti´s side second|
|Giampaolo promises more from ´extraordinary´ Sampdoria|
|Record-breaking Valencia tee up blockbuster Barcelona clash|
|Poor West Ham performance at Watford was to be expected - Moyes|
|We will see what happens in the future - Silva non-committal on Everton rumours|
|Stones can bounce back stronger - Kompany|
|Football needs to do more to combat racism - Boateng|
|Watford 2 West Ham 0: Misery for Moyes on Hammers bow|
|Unlucky 13: Benevento suffer record-breaking defeat|
|Juventus lost composure amid Sampdoria onslaught - Allegri|
|Sampdoria 3 Juventus 2: Champions slip further off the pace after thriller|
|Coleman confirmed as Sunderland boss|
|I was just injured - Belgium´s Nainggolan blasts ´stupid´ claims of feigned ailment|
|Leeds United 2 Middlesbrough 1: Losing streak snapped to ease pressure on Christiansen|
|Hughes backs Giggs for Wales job|
|Madrid confirm Ramos´ broken nose after derby clash|
|Kane wants to retire with Tottenham|
|Mourinho: Man United lacked balance with attacking line-up|
|Pastore not considering PSG exit to help World Cup chances|
|Wenger, Ozil & Sanchez uncertainty affecting Arsenal, says Seaman|
|Silva not surprised by Chelsea, Spurs interest in Richarlison|
|Ancelotti, Conte, Allegri on shortlist to replace Ventura|
|Perth Glory 0 Melbourne Victory 2: Visitors claim first A-League win of season|
|Marcelo unaware of Ramos-Ronaldo rift at Real Madrid|
|Neymar will take PSG´s next penalty - Cavani|
|Ranieri would consider coaching Italy|
|Postecoglou set for decision on Socceroos future|
|Championship Review: Millwall deny sloppy Sunderland, Wolves back on top|
|Simeone rallies around under-fire Griezmann|
|It´s a growth process - Montella optimistic despite Napoli loss|
|Spalletti happy at Inter, tips Ancelotti for Italy job|
|Sarri defends sacked Ventura over Insigne´s Italy snub|