Manchester City winger Martin Petrov is expected to be sidelined ''for quite some time'' according to manager Mark Hughes after suffering knee ligament damage.
However Robinho looks certain to shake off a thigh problem and face Newcastle on Monday.
Petrov, who only recently returned to the City side following a hamstring stain, was injured in midweek in Bulgaria's draw against Georgia.
Hughes said: ''Martin is going to see a couple more specialists over the weekend. But the view is, he has a significant injury and could be out for quite some time.
''He has ligament damage and the initial scans do not look good.
''Martin had 10 minutes in one game and 20 minutes in another before going to play his country.
''It is a big ask for players and they are at risk on occasions if they have not had the required time on the pitch beforehand.''
Hughes has heard nothing from the Brazil authorities after Robinho came off during the draw with Colombia - and the City boss believes the silence is good news.
The former Real Madrid forward was due to return today and Hughes said: ''We have heard nothing from their medical department, so we are assuming he is fit and well.
''We have seen the incident where he had the injury and had to come off. It does not look like a significant injury, just a clash.''