Ansu Fati left Barcelona's Copa del Rey match in tears on Thursday with the club confirming Friday that the young star has suffered another hamstring injury.
The forward walked straight down the tunnel upon his exit in the last-16 match, which ended with Barca crashing out in a 3-2 defeat.
Fati, 19, only recently returned from a serious hamstring injury and missed most of last year with knee problems.
What has been said?
"Tests carried out on the first team player Ansu Fati on Friday confirmed that he has a proximal tendon injury in the hamstring of his left leg," the club said in a statement.
"In the coming days the treatment to be carried out will be decided."
In his postgame comments, manager Xavi added that Pedri, Gerard Pique and Jordi Alba also picked up knocks.
Fati emotional as he walks off
Fati was embraced by manager Xavi before disappearing down the tunnel.
What happened in the match?
Barcelona fought back to level at 2-2 in stoppage time, with Pedri providing the equaliser, but ultimately were defeated through a 105th-minute goal from Iker Muniain.
Fati had been introduced in the 61st minute as a substitute before his eventual departure.