The midfielder has been linked with a move away from Old Trafford as the Red Devils look to trim their wage bill but suggested that his future will be settled at a time closer to this summer's transfer window.
Casemiro – who is contracted at United until 2026 – told reporters: "It's too soon to talk about next season, but of course I have another year of contract and then an option. We have important games, and on Sunday (09.03.25) we have Arsenal.
"It's too soon to talk about next season. I'm here, I'm available, with total happiness, and I'm ready for the coach and the club. As everyone knows, I'm a big character for the club."
The former Real Madrid player has featured less prominently since Ruben Amorim took charge in November and admits that he is keen to play a more instrumental role at United.
The Brazilian international said: "Of course I want to play, but I always say, and these are my values, I respect the coach a lot, I respect the club.
"Every day I go to Carrington or Old Trafford I try to do my best. If a player is on the bench and is happy, that player is not worth anything for any team.
"Of course I want to play, I want to have more minutes, but the coach is the one who makes the decisions, and I have a lot of respect for him and for the club."
Casemiro has struggled with the pace of the Premier League but insisted that he has a "lot left to give" in his career.
The five-time Champions League winner said recently: "I'm young, and I've got a lot left to give.
"I'm about to turn 33. Nowadays that's like being 28 before - with nutrition, physical preparation, all that extending a player's career if you look after yourself. That's why Cristiano [Ronaldo] is still scoring 50 goals a season, at 40 years old."