Real Madrid full-back Marcelo admits the squad are concerned by the fans' whistling of team-mate Gareth Bale.
The Wales international has been targeted by sections of the Santiago Bernabeu support this season after some unconvincing displays.
Bale was subjected to more jeers on Wednesday, despite recording two assists in Madrid's 3-0 Champions League victory over APOEL.
Marcelo believes the former Tottenham star's injury concerns are behind him, but suggested his morale has been affected.
"Of course we're worried," he told a news conference when asked about Bale. "The important thing is to know if he's happy or not. The person who is happy off the pitch is also happy on it.
"He got two assists. He doesn't look bad physically, but I'm a player, not a coach."
Marcelo was speaking after officially signing a new five-year contract with LaLiga and European champions.
@MarceloM12
— Real Madrid C.F.
4 La Liga titles
3 Champions League
2 Club World Cup
3 UEFA Super Cup#HalaMadrid https://t.co/Va7LnSYdob