The Serbia international scored only four goals in the Championship as the Magpies claimed automatic promotion to the Premier League.
Mitrovic has revealed that if offers come in he may likely go elsewhere, but he is also happy to stay at Newcastle.
"I'm very happy to help Newcastle back to the Premier League because that's where the club deserves to be," he said, according to the Daily Mail.
"I want to rest my head and body now. I'm really tired. Then next season we will see.
"I don't know anything. I heard something about other clubs. If some good offers for me - which are also good for the club - come in over the summer then we will speak about it.
"If it doesn't happen then I'm still a Newcastle United player, I have three years on my contract. So we have to speak to the club, to the manager and we will see."