The Spaniard made his feelings about Honda's continuing problems clear at Spa, where over the radio he said using the Japanese power unit was "embarrassing".
Asked if McLaren need to switch to a different supplier to convince him to stay at the team next year, Alonso answered: "Let's see how events develop in the next two, three weeks.
"I'm just the driver, so my job is to drive as fast as I can rather than make those decisions.
"I like this team. The last three seasons were difficult but McLaren is one of the best teams in the world.
"I would be glad to continue but we'll see what happens in the next few weeks."
The big rumour in Belgium is that Williams-Mercedes has made a clear offer to Alonso for 2018.
"I have nothing to say. Nothing new," he responded.
"The demand for my services is very high, which I can see from the proposals that I have received."
Alonso has picked up 10 points for McLaren in 2017.