Would take more than that to prise him away, they don't need money. Also, he's not leaving. Decent player though, can't see how he'd fit into your setup other than as a bit-part player off the bench, for which he only needs to look at Andrew Surman (Wolves) to be reminded that it's not worth moving to the big leagues right away.
(Shelvey looks very promising, would be worthwhile and Charlton aren't exactly swimming in cash, especially if they stay in League 1)