Lewis Hamilton had the fastest time in the final practice session at the Italian Grand Prix, edging out championship leader Fernando Alonso by one thousandth of a second.

As speculation about his future and a possible switch to Mercedes continued, Hamilton posted a time of 1 minute, 24.578 seconds in perfect conditions at Monza on Saturday.

Alonso put Friday's problems behind him and delivered a strong performance, but was beaten by a flying lap from the McLaren driver, 5 minutes from the end of the session.

Paul Di Resta was third, but his chances of a points finish on Sunday took a blow after he was handed a five-place grid penalty because of a gearbox change.

A gearbox is supposed to last five consecutive races under FIA regulations.