Mats Hummels a German center defender that had lot of rumors to transfer to Manchester United went down as Van Gaal is not interested any more. This might give green signal to the Arsenal as Arsène Wenger planning to bid a high amount.
Mats Hummels was part of the winning world cup team and runner up in last UEFA champion league. He is currently captain of Borussia Dortmund and gave interview last month that he might not leave Dortmund for big money as he love to play in this club that went up from small and set example like Gerrard that he is still playing Liverpool.
Lot of clubs might try to sign contract with him and Arsenal is planing some big amount. Lets wait for some big news.