Time running out for 2011 tire supply deal – Michelin
With the teams close to selecting Pirelli as their tire supplier for 2011, Shorrock travelled to Istanbul to make Michelin's alternative proposal clearer.
It is still believed that F1 is close to appointing Milan-based Pirelli as departing Bridgestone's successor, but Shorrock on Thursday would not rule Michelin out.
"Since the trip that I made to Istanbul two weeks ago, the objective of which was to meet with the teams to talk about the details of our offer, I've had no feedback, but I am expecting some," he is quoted by the AFP news agency.
"But time is getting very tight to develop a product that is consistent, delivers good performance and above all is safe."
Both Pirelli and FIA president Jean Todt have indicated that a final decision about the 2011 tire supply is not imminent.
But Shorrock warned: "Within the next couple of weeks if there's not enough information then it's going to make life extremely hard for all parties.
"My past experience of F1 is around this time people start moving on to next year's car. If you're not on board in June/July time you will be struggling," he added.