"I think the first thing to understand is that he has a contract," he told the Brazilian broadcaster Sportv this week.
"If he leaves now, he'll be stuck until next year, and for what?
"He has a huge contract, so he will stay there and fulfil it - although it's true that anything can happen.
"If he's thinking of moving to a competitive team, that's not for this year. Stop in the middle? I don't think so, but as I said, nothing is impossible."
Massa's views contrast with those of Mark Webber. The Australian warned this week that Alonso's frustration with the situation at McLaren could see the Spaniard quit the team.
Alonso will be a free agent when his contract expires at the end of 2017. It seems unlikely he'll recommit to McLaren unless significant improvements are made.
Read the full article on eurosport.co.uk: Alonso won't quit McLaren, says Massa