Arsenal defender Per Mertesacker is working on Borussia Dortmund skipper Mats Hummels. The Mail on Sunday says Mertesacker is trying to help broker a deal to bring German international Hummels, his former national team defensive partner, to the Emirates.
But the bottom line is matching the fee that Borussia Dortmund want - which could be as much as £47m.
The Gunners are unlikely to pay that - but Manchester United may well do - as soon as the January transfer window opens.
