Chelsea midfielder Romeo Lavia (20) will miss the rest of the season after suffering a setback in his recovery from a hamstring injury, the Premier League club said on Wednesday.
The Belgium international was injured during his Chelsea debut, a 2-1 win over Crystal Palace in late December.
The former Manchester City and Southampton player joined Chelsea in August on a seven-year contract in a deal worth a reported 55 million pounds.
Chelsea, 11th in the Premier League table, host Burnley on Saturday.