Sebastian Vettel insists he is satisfied with Pirelli's investigation into the tyre blow-out which he claimed could have killed him at the Belgian Grand Prix.
Pirelli, Formula One's sole tyre supplier, issued the findings from their probe into the high-profile failing sustained by Vettel on the penultimate lap of the Spa-Francorchamps race.
In a statement released ahead of Sunday's Italian Grand Prix, Pirelli stated that Vettel's puncture was caused by a cut from "external factors" such as debris, in addition to prolonged usage at a circuit which is "particularly demanding".
It goes against Pirelli's original claim that tyre wear was the main contributor to Vettel's puncture after Ferrari attempted an aggressive one-stop strategy.
Vettel, the four-time world champion, was incandescent immediately after the race in Spa, but was in a more reflective mood here in Monza.
"It is not acceptable to have a blow-up at that sort of speed, out of the blue, and that is what I said after the race so there is nothing to add," he said.
"The investigations that have been going on, the stuff that obviously got analysed and talked about explained some of it - maybe not all of it yet - but it is still ongoing.
"The most important thing is that we make progress. From Pirelli's side it looks very professional, they handle it with extreme care, so I think they are going the right way.
"There is some short-term changes and we will see how it feels. Long-term we need to understand properly what happened."
Pirelli came under fire after the British Grand Prix in 2013 following a number of tyre blow-outs during the race at Silverstone.
Vettel added: "It is very clear that everybody is trying to do its best. We had a situation a couple of years ago which wasn't acceptable. There was immediate change and we did not have problems afterwards so you can see that professional approach does work and leads usually to the right result."
Pirelli said they had a total of 63 cuts to their tyres during the course of the Belgian Grand Prix weekend. The Italian manufacturer claimed that in 15 previous events, including five test sessions, an average of only 1.2 cuts were noted.
Nico Rosberg, who became a father for the first time this week, was also fortunate to emerge unscathed from a 190mph tyre blow-out in practice.
And ahead of Sunday's race in Monza - the fastest on the Formula One calendar - Pirelli insisted there were no structural problems with its product.
But Felipe Massa, who it was announced will remain at Williams alongside Valtteri Bottas next season, does not believe on-track debris should have contributed to two high-speed failures.
"Debris we have at every race, and at some races we have more debris than others," he said.
"The tyre needs to be strong enough to accept the debris or what we have inside the track. It should not be common."
Source: PA
