No Hoops Problem is he can now talk to other clubs so they could offer more.
No he can't. He can only talk to clubs where the transfer would be to a "foreign" club (i.e. outside the English FA). He could also sign a pre-contract with them.
He can't talk to English clubs until near the end of the season (it might even be later than that but I can't remember the exact rules).
(this obviously excludes "tapping up")