Maranello - Ferrari has yet to decide whether to change the power unit in Carlos Sainz's fire-damaged car, a move that would trigger a grid penalty for Sunday's French Formula One Grand Prix.
The Spaniard, a race winner in Britain this month, retired in Austria 10 days ago with his engine in flames while chasing second place.
An engine change appeared inevitable but Sainz, who has already used up his allocation of three for the season, told reporters at Le Castellet on Thursday that it was still under evaluation.
"We are still looking at all the available options," he said.
"We also need to see a bit how the overtaking is here, how everything comes into play you know with the heat, the tyres and we will take a decision but obviously there is a chance it will happen."
Ferrari could substitute a used engine and components to stave off the penalty but the next race is in Hungary, where overtaking is not easy.
The Italian team, which won in Austria with Charles Leclerc, is second in the constructors' standings but 56 points behind Red Bull.