The People says Chelsea boss Andre Villas-Boas has told scouts to keep tabs on Grenier with a view to a move next summer.
The Frenchman, 20, has been likened to Frank Lampard in his homeland, with Lyon valuing him at around £9m.
Tribal Football Staff are dedicated to the football tribes from all over the world. Our team is passionate about delivering football news to our hundreds of thousands of followers in all the corners of the globe. Football is life, It never stops, Neither do we.