According to Bayern Munich coach, new united player Bastian Schweinsteiger hasn’t been fit for two years.
Schweinsteiger joined United in a deal worth £12 million after spending a major part of his career at Bayern, but has been plagued with injury.
The Germany internation made just 15 appearances for Bayern las season, with the Spaniard saying his fitness is a concern.
“When he does not have injury problems, I am completely convinced he will do very well at Manchester United,” Guardiola told reporters. “He is a top, top player.
“Unfortunately, he has had some problems with injuries in the past two years and he was not always 100 per cent fit. He is going to play really good [at United]. I really hope that is going to happen.”