The move is seen as part of Ukraine's efforts to reinforce its army as soldiers struggle to hold positions against Russia
Having spent most of the season on the bench at Real Madrid before signing for Hamburg 10 days ago, the 33-year-old Dutch hot-shot striker is only 60 percent fit, according to Labbadia.
And it looks as though the striker will sit out Hamburg’s Bundesliga game at Cologne on Sunday and needs plenty of fitness work after knee surgery in November 2008 and having played just 127 minutes of football for Real this season.
‘We would never put someone under a pressure of time to say when they will be fit,’ Labbadia told SID, a subsidiary of AFP, with his side fifth in the German league table.
‘Ruud is still working his way back to fitness and it is only 60 percent.
‘Whether or not he is in the squad, we will decide at the end of the week.’
Labbadia says the Dutchman needs ‘a few more weeks’ to return to top fitness.
‘We don’t want to rush him back too early and risk him getting injured,’ said Labbadia.
A calf injury meant van Nistelrooy only trained with the squad for the first time on Tuesday.
‘He has not played for the best part of a year, it is a different story if a player has just been out for a few weeks.’
Van Nistelrooy has signed a contract until June 2011 and Hamburg are reported to have spent four million euros (5.65 million US dollars) on him.
He has already been crowned the best striker in Holland, having scored 62 goals for Eindhoven between 1998 and 2001, England, having scored 95 goals for Manchester United between 2001-06 and Spain, having netted 46 goals for Real between 2006 and 2010.
Having retired after Holland were knocked out of Euro 2008 by Russia in the quarter-finals, van Nistelrooy has said he would like to play for the Netherlands again at this summer’s World Cup.
The move is seen as part of Ukraine's efforts to reinforce its army as soldiers struggle to hold positions against Russia
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