The Australian was linked with a move all last year, as Boro looked to shed his wages given he is one of their highest earners.
But McDonald - who finished as the club's top scorer with 12 goals, despite not starting the season - has 12 months left on his current deal and is not in a hurry to leave.
"We all know what the situation is, we all know that it will be another summer of question marks, stories and rumours about my future," the former Celtic striker told the Evening Gazette.
"It was like that last summer, with everything up in the air and a lot of talk about if I was going, when I was going, where I was going.
"But look, I don't mind all the speculation. It doesn't bother me. I can't let it get to me or distract me. I just ignore it and get on with my job.
"I've already said that I'll sit down when the season is over and talk to the manager and the club about what's best for me and for everyone and we will take it from there.
"People and the press can speculate and talk all they like, the manager and the people above that understand what the situation is.
"I just enjoy playing football. That's what I do. The other things I can't control. My future's up in the air and we know that.
"But everyone's is up in the air. Why shouldn't it be?"