Bayern Munich midfielder Jamal Musiala was replaced as he clutched his hamstring against Augsburg in the German Bundesliga on Friday, days out from the Champions League quarterfinal against Inter Milan.
Germany's Musiala fell to the turf after trying to connect with a high pass and raised his hand, motioning to the bench.
The 22-year-old midfielder was helped from the field, replaced by veteran Bayern midfielder Thomas Mueller.
An injury to Musiala, an increasingly important component of Bayern's star-studded midfield, would be a major blow to the depleted outfit.
Bayern defenders Alphonso Davies, Dayot Upamecano and Hiroki Ito look set to miss the remainder of the season, while goalkeeper Manuel Neuer, winger Kingsley Coman and midfielder Aleksander Pavlovic are also sidelined.
Bayern came into the match against Augsburg with a six-point lead ahead of defending champions Bayer Leverkusen atop the Bundesliga table.
The six-time Champions League winners host Inter Milan on Tuesday, with the return leg the following Wednesday in Italy.
This season's Champions League final will be at Bayern's Allianz Arena home.