"The front left tyre looks pretty bad," he's now 3.1s behind Piastri at the front.
This puts him 2.5s ahead of Norris.
Piastri, Norris, Leclerc, Sainz, Hamilton, Verstappen, Perez, Russell, Alonso, Ocon, Albon, Magnussen, Bottas, Ricciardo, Gasly, Colapinto, Stroll, Hulkenberg and Zhou.
OUT: Tsunoda.
He puts in another fastest lap of the race to extend his lead over Norris to 2.3s.
He's been given a 10-second time penalty for colliding with Gasly.
Piastri, Norris, Leclerc, Sainz, Hamilton, Verstappen, Ocon, Perez, Russell, Alonso, Bottas, Albon, Magnussen, Gasly, Ricciardo, Colapinto, Stroll, Hulkenberg and Zhou.
OUT: Tsunoda.
He rejoins in eighth in the second Red Bull.
Verstappen pits for a set of hards tyres in the Red Bull.
Verstappen, Perez, Piastri, Norris, Leclerc, Sainz, Hamilton, Ocon, Russell and Bottas.
Sainz comes into the pit lane on the end of Lap 19 for hard tyres. He rejoins in sixth, just ahead of Hamilton.
"Lando it's likely we will have to cover for the other car. It will be papaya rules."
Sainz, Verstappen, Perez, Piastri, Norris, Leclerc, Ocon, Stroll, Hamilton and Bottas.
Piastri rejoins ahead of Albon and Norris in the fight for the net lead.
Norris manages to get ahead of Leclerc through the pit stop phase. A good call by McLaren.
Leclerc and Hamilton come into the pit lane for fresh rubber in response to Norris' pit stop.
New hard tyres for the McLaren driver. He rejoins in eighth on Lap 15.
McLaren are looking to undercut Leclerc.
He's now running 3.0s ahead of Leclerc in the lead, while Norris is in DRS range of the Ferrari driver.
Piastri, Leclerc, Norris, Sainz, Hamilton, Verstappen, Perez, Albon, Magnussen and Ocon.
He's now 1.0s behind Leclerc in the battle for second at Monza.
Piastri has upped his lead over Leclerc to 1.6s now. Norris is running 1.3s behind the Ferrari driver now.
Perez makes the most of DRS to breezes past Russell into Turn 1. That's sixth and seventh now for the two Red Bull drivers.
Leclerc sets the fastest lap of the race - marginally quicker than Piastri. They are separated by around one-second currently.
A five-second time penalty for the RB driver after causing a collision with Hulkenberg on the run to Ascari on Lap 1.
Hulkenberg has been given a 10-second penalty for the Tsunoda incident.
He's told: "Box to retire the car". He had contact with Hulkenberg a couple of laps ago at Turn 1.
Piastri, Leclerc, Norris, Sainz, Hamilton, Verstappen, Russell, Perez, Albon and Alonso.