Steve Bruce claims a slight knock picked up by Sunderland new boy John O'Shea is nothing to be concerned about.
The Republic of Ireland international, who has joined the Black Cats from Manchester United, limped out of Sunday's 1-1 draw with Arminia Bielefield.
He then sat out a 3-1 defeat to Hannover on Wednesday, with his situation having shown no sign of improvement.
There is now no chance of him figuring in a weekend clash with Borussia Monchengladbach, with it understood that he will be sidelined for up to a fortnight.
That will give O'Shea little preparation time ahead of the new Premier League campaign, with pre-season vital to those players who change clubs and need to acclimatise in new surroundings.
He is not going to get that, but Bruce is taking a relaxed approach to the problem and is confident the 30-year-old will be up to speed by the time Sunderland go to Liverpool on the opening day.
"It's disappointing that John hasn't played here (in Hannover), but we have still got three weeks left," Bruce told the Sunderland Echo.
"We need him to be ready in a few weeks' time, not now. We have got games when we get back.
"It would be nice to see him play, but he got his leg in a difficult position against Arminia Bielefeld on Sunday and strained a muscle.
"We will have to keep an eye on how he is. The last thing we want to do now is risk anybody. If they have got anything slight, I would rather them give training and the games a rest.
"But the vast majority got through the game yesterday and hopefully everyone's okay."