Felix Magath defended Kostas Mitroglou after the striker's lacklustre display in Fulham's 3-1 defeat at Cardiff City on Saturday.
The London outfit fell to a morale-crushing defeat in Wales that keeps them four points adrift of safety at the foot of the Premier League table.
Steven Caulker scored twice for the hosts, either side of Lewis Holtby's equaliser, before Sascha Riether's own goal put the seal on a miserable day for Magath and his team.
Mitroglou made his first start since a big-money move from Olympiacos in January, but failed to impress and appeared short of match fitness.
Magath, who only took over from Rene Meulensteen once the Greece international had already been signed, said on Thursday that Mitroglou was not match fit, despite playing an hour in midweek for his national team.
However, Magath raised a few eyebrows by first selecting the 25-year-old in his starting XI and then giving him the full 90 minutes despite a disappointing showing.
"He is not used to a relegation fight," said Magath of Mitroglou.
"He came from the best club in Greece and the best club was better than the others in the league.
"He's only used to scoring and that's his strength. Here in the Premier League it's the best league in the world so he needs to get used to it.
"He's not used to it. Unfortunately he had some opportunities but at the moment he's not in the situation to score."
|4||S. Caulker||45+1' 67'|
|Coach: O. Solskjær|
for F. Campbell 72'
for G. Medel 80'
for B. Turner 90'
|Coleman sees shades of Charles in Bale winner|
|Conte only concerned about Italy winning|
|Mauritania v South Africa: SAFA to investigate Masilela no-show|
|AFC World Cup Qualifying Review: Qatar hit 15 in Bhutan rout|
|Belgium 3 Bosnia-Herzegovina 1: De Bruyne shines in straightforward victory|
|Cyprus 0 Wales 1: Bale winner takes Wales one step closer|
|Netherlands 0 Iceland 1: Sigurdsson winner caps difficult first game for Blind|
|Italy 1 Malta 0: Pelle spares wasteful Azzurri|
|Balotelli stars in Milan friendly win|
|Bhutan thrashed 15-0 by Qatar in qualifier|
|Rwanda v Ghana: Gyan doubt gives hosts hope|
|Tanzania v Nigeria: Enyeama out of AFCON qualifier|
|Valdes and Berahino included in Premier League squads|
|Costa Rica v Brazil: Dunga´s men return after Copa disappointment|
|Spain v Slovakia: Azpilicueta eyeing important revenge|
|Adebayor left out of Tottenham squad list for league and Europe|
|San Marino v England: Place in history books beckons for Rooney|
|Germany can cope with Reus absence - Low|
|Bayern offer aid to refugees in ´training camp´|
|BREAKING NEWS: Welbeck ruled out for months after knee surgery|
|South Korea 8 Laos 0: Son leads the way in rout|
|Australia 5 Bangladesh 0: Socceroos surge to emphatic win|
|Japan 3 Cambodia 0: Hosts pick up first qualifying win|
|Rudiger aiming to nail down Euros spot after Roma move|
|Melo happy to join Inter at last|
|Hernandez thanks Ferguson after United departure|
|Chung: AFC has compromised FIFA election|
|Wales the new best of British|
|Reus out of Germany qualifiers|
|Chile v Paraguay: Vidal missing for Copa champions|
|Ghedin: Anything is possible for Malta|
|Pogba will be worth €100m - Marotta|
|England can win Euro 2016 - Hodgson tells players|
|Conte unsure over Balotelli future|
|Portugal - France Preview: Deschamps aiming to correct mistakes|
|Martial never the same again - Mangala|
|Copa del Rey Review: Racing fall at the first|
|Shelvey dismisses talk of England snub|
|Galatasaray unable to play Grosskreutz|
|Faroe Islands v Northern Ireland: O´Neill preaches patience ahead of Euro double-header|
|Levy slams ´wholly inappropriate´ West Brom after Berahino chase|
|Panama v Uruguay: Visitors without Suarez and Cavani|
|Captaincy won´t change me - Robben|
|Liverpool sign Brazilian youngster Allan|
|PFA expects swift Berahino resolution|
|Argentina v Bolivia: Mascherano backs ´very special´ Messi|
|´I do not know if I´m worth €80million´ - Martial shocked at price-tag|
|Afellay suspension reduced|
|Noble red card rescinded|
|Portugal v France: Deschamps aiming to correct mistakes|
|Bahebeck given the all clear|
|Germany v Poland: Muller out to settle the score|
|Gibraltar v Republic of Ireland: Keane counting on McCarthy and Walters|
|Georgia v Scotland: Tbilisi trip has must-win feel for Robertson|
|Juve still the team to beat - Hernanes|
|De Gea will remain professional, says team-mate Mata|
|Berahino given extra time off following strike tweet|
|´No excuses´ as Costa seeks to kick-start season|
|I´m not like Messi or Ronaldo – Hazard|
|United States v Peru: Klinsmann out to ´prove a point´|
|Martinez unsure when Cleverley will return|
|France set for Russia friendly ahead of Euros|
|Former Manchester United forward Berbatov joins PAOK|
|De Gea must play to earn Euro 2016 spot – Del Bosque|
|Cahill thrilled to lead Socceroos|
|Wijnaldum urges patience with new-look Newcastle|
|Reid praises Stones´ professionalism|
|Mexico v Trinidad and Tobago: Islanders hoping to build on Gold Cup display|
|Choosing Brazil over Spain was easiest decision, says Rafinha|
|Galliani hails ´changed´ Balotelli|
|OFC World Cup Qualifying Review: American Samoa notch second competitive win|
|Canada v Belize: Hosts look to stay calm|
|Carragher surprised by ´big´ Martial price|
|No pressure on Rodgers - Rush|
|No Benzema, no Cavani - Arsenal ´can´t compete´ says Sol Campbell|
|FFA muzzle Postecoglou after pay dispute criticism|
|Celtic complete Simunovic signing|
|Joaquin: I´m as happy as a little boy|
|Navas given time off by Costa Rica|
|Martial unfazed by prospect of United pressure|
|Ramos urges De Gea to overcome transfer woe|