Press have linked us with Lucas, but Cavani too, I don't think Cavani would be wise considering his sizeable price-tag, great player, but looks like he forgot how to use his legs after his injury, although he will come back from it, don't want to pay so much for a 27 year old striker.
Lucas would be good his pace, I personally like Griezmann because of his technique, although different kinds of players (Lucas is 21, so yes it would be exciting to have his kind of pace but his goal scoring record is poor for a winger).