Olivier Giroud has demanded a "more important role" in order to stay at Chelsea next season.
France's World Cup-winning striker admitted he has yet to meet Chelsea's board about whether he will remain at Stamford Bridge.
Chelsea have the option to extend the 32-year-old's deal by another year, with Giroud hoping for a meeting with club bosses before the end of the campaign.
"Trust me I'm very frustrated when I'm not on the pitch, but I just don't want to show it," said Giroud.
"You need to keep that frustration for you. And transform that into positive energy on the pitch.
"But trust me I'm not happy to play the second role. That's why I said next year I will need to have more important role to play in the team."
Head coach Maurizio Sarri has already said he expects Giroud to stay at Chelsea next term, but the striker himself has now revealed doubts on his future.
Galatasaray are understood to have made contact with Giroud about next season.
Asked if he has been approached by other clubs, Giroud said: "Yes but I won't tell you. The priority is Chelsea."
When pressed on when he will talk to the club about next season, Giroud said: "I don't know, I have no clue about that now. But before the end of the season.
"I have to meet (club director) Marina (Granovskaia), but obviously I might be here.
"The thing is I just want to enjoy it because I'm 32 and I've won the World Cup. But I want to retire satisfied."
Rudiger hobbled out of Sunday's 2-0 Premier League defeat at Liverpool, but assistant coach Gianfranco Zola hopes he might be fit in time for the trip to Manchester United on April 28.
"It doesn't look as bad as we first thought," said Zola, standing in for Sarri, who had an operation on a tooth on Wednesday.
"I think there's a strong possibility we'll see him for Manchester United. He's a warrior and he won't want to miss a game like that."
