Pirelli is adamant that Nico Rosberg's tyre failure in Belgian Grand Prix practice on Friday was a one-off caused by an unknown external source.
Following investigations that continued overnight ahead of Saturday's action at Spa-Francorchamps, the Italian company was able to completely rule out a failure caused by a structural weakness.
In a statement issued while final practice was underway, Pirelli said there had been no sign of structural problems on any of the tyres used by Mercedes or any of the other teams.
Furthermore, a close look at video footage of Rosberg's tyre as it failed suggested that it was consistent with an external cut.
Pirelli motorsport director Paul Hembery said: “We have conducted a thorough investigation to find out exactly what happened with Nico’s tyre.
“This investigation now excludes any structural integrity issues. Based on the information and data available an external source of damage is the conclusion made.”