Paris Saint-Germain midfielder Ander Herrera is set to miss up to four weeks of action with a calf injury, the club announced on Wednesday.
Herrera, 29, is in his first season with the Ligue 1 champions, having left Manchester United on a free transfer after five-year stay with the Premier League club.
The Spaniard suffered the injury in training on Wednesday, meaning he will miss out on the start of the season with his new club.
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PSG open their Ligue 1 campaign with a match against Nimes on Sunday, before taking on Rennes the following weekend.