Lyon boss Laurent Blanc has fired a warning to Chelsea over new signing Malo Gusto’s hamstring injury.

Chelsea signed Gusto during the January transfer window and loaned him straight back to Lyon for the rest of the season after he signed a seven-and-a-half-year contract at Stamford Bridge.

Gusto suffered a hamstring injury Gusto sustained a hamstring injury on Wednesday during Lyon’s French Cup 2-2 draw with Lille and could now be set for a spell on the sidelines.

Lyon boss Blanc told French outlet L’Equipe: “We have a problem with Malo.

“He injured his hamstring a few games ago and he recovered. He still has discomfort. You have to treat it well, but it’s not much.

“I hope that Lyon and Chelsea will show common sense. In any case, he is not fit to play a Ligue 1 match, it is better to wait. But he could be on the bench.”