Pirelli is set to secure the role of F1 tyre supplier for 2011 with a decision expected to be made before the European Grand Prix in Valencia later this month.

The Italian manufacturer has been in pole position to secure the deal for some time although president Marco Tronchetti admitted earlier this week that a decision was still 'weeks' away.

That decision looks like now being confirmed before the event in Spain, with sources within Pirelli telling 422race.com that the company will be the new supplier and that the news will be announced officially before Valencia.

The report suggests that a deal could have been agreed in Turkey had it not been for three teams that didn't agree with the offer on the table - which in turn allowed Michelin to come back in with an eleventh-hour offer of its own.

The big issue for teams with the current delay is that the design of 2011 cars is already underway - despite the teams being unaware of what tyres they cars will run on.

It now appears likely that Pirelli will provide tyres of the same size for 2011 before swapping to a larger tyre from 2012 and beyond.

Official confirmation of the deal should come after the FIA finalises the details of the contract.