Manchester United defender Victor Lindelof is underdoing investigations into the cause of the breathing difficulties he suffered on Saturday but it is not believed to be related to the Covid-19 outbreak at the club.
Lindelof, 27, was substituted in the 74th minute of United's 1-0 win over Norwich at Carrow Road on Saturday evening after struggling to catch his breath.
Ralf Rangnick said after the match the Sweden defender also had a higher heart rate than normal, prompting the decision to replace him.
In a statement on Tuesday, United said: "Victor is currently undergoing a series of precautionary investigations. He has recovered well from the episode he experienced in the match against Norwich.
"All indications are that this is not linked to any Covid outbreak within the club."
United's Premier League match away to Brentford, scheduled for Tuesday night, was postponed after a number of positive Covid-19 tests among players and staff led to the closure of their Carrington training complex on Monday