Ghanaian midfielder Thomas Partey has stepped up his recovery from a thigh strain picked up on Monday.
The 21-year-old picked up the problem while training with Atletico Madrid.
The highly-rated Ghanaian youngster has stepped up gym work as he attempts to return to full fitness.
Partey is expected to be out for at least seven days.
He will miss Atletico Madrid's League game against Getafe.