Manchester United and Arsenal are weighing up a shock move for Chelsea striker Diego Costa.

The Sun says former club Atletico Madrid are favourites to re-sign the fiery hitman despite a transfer ban.

The Spaniards are still able to buy players but not register them under a Fifa transfer embargo which runs until January.

Costa, 28, could sign for Atletico and go on loan until the New Year — with AC Milan up for a short-term deal.

Manchester United and Arsenal are also both on the hunt for a top hitman - and are seriously considering entering the race for Costa.

Sources close to Chelsea say Costa had already made up his mind not to play for manager Antonio Conte again long before his bombshell announcement on Wednesday night.