The double world champion’s return to Mclaren this season has been underwhelming as he heads into the Formula 1 race in hometown Barcelona on Sunday without a point.
“I wonder if he might win another race or championship,” said Trulli.
“McLaren won’t get on top of the problems quickly and won’t easily catch up with the teams in front next year.”
The 33-year-old then re-joined McLaren on a three-year deal, having first driven for them for one season in 2007.