Lewis Hamilton believes Ferrari have “no rules” of engagement between their drivers after the first-lap incident between the Briton and Charles Leclerc at the Italian Grand Prix on Sunday.Hamilton, starting in fourth, launched his car boldly up the outside of the first chicane with Leclerc holding the inside line. However, Hamilton was forced wide onto the gravel and dropped rapidly down the order. A lap later, Leclerc crashed out of Ferrari’s home race after a big shunt at Parabolica, while Hamilton came home sixth as he lost out in mid-race battles to the McLarens of Lando Norris and Oscar Piastri. Hamilton went on to declare himself out of the running for the 2026 F1 world title – he now trails race winner and championship leader Kimi Antonelli by 76 points – and insists his Scuderia team “need to address” how their drivers go racing against each other. "I think it comes down to rules of engagement," said Hamilton. "When I was at Mercedes, we had written rules of engagement. We never really, really had it too bad. There was a moment between me and Nico [Rosberg] a couple of times, but more often not, it was good."Here, there are no rules. We need to address that."Regarding the lap-one incident, Rosberg believed Leclerc was at fault given Hamilton was ahead at the apex. However, fellow Sky F1 pundit Martin Brundle disagreed, insisting the stewards taking “no further action” was the right call. Rosberg said: “The rules are, if the driver on the outside, which in this case is Lewis, is ahead at some point towards the apex or during turn-in, the guy on the inside must leave room."It's very straightforward and simple. Lewis was ahead going in, so Charles has to leave room. And he didn't, so it was 100 per cent Charles' fault and that's it."Brundle, however, took a different standpoint: "Leclerc was far enough ahead on the inside of the corner there. I don't think he would have taken a penalty. Lewis Hamilton and Charles Leclerc clashed on Sunday (PA)"Lewis dived down the inside of him into the first apex, fair enough, that's motor racing. Leclerc, I think at the apex, was far enough ahead, and on the inside by the way, which is another key element."Leclerc just understeers wide. He turns the wheel and the car didn't bite, and that's very normal on the first lap. I don't believe he would have been penalised."On the same weekend, Hamilton implored his Ferrari team to throw their full weight behind the 41-year-old’s championship challenge, with Leclerc now 36 points behind his teammate in the standings. The next F1 race is the Spanish Grand Prix at the new street circuit in Madrid this Sunday.