William Gallas says former Chelsea attacker Diego Costa would add ‘character’ to Arsenal’s roster with his ability to spark his team-mates into action.

Diego became a free agent at the end of last month after agreeing to terminate his deal with Atletico Madrid six months early.

The 32-year-old Spaniard was a nemesis of the Gunners during his previous three-year stint at Stamford Bridge in which he scored a stunning 52 goals and helped fire the west Londoners to two Premier League titles.

But he made just seven appearances at Atletico this term due to increased competition for his place and a combination of injuries in Diego Simeone’s side.

Costa is now available on a free transfer this month, and ex-Arsenal and Chelsea defender Gallas believes his old club could benefit from the centre-forward’s fiery nature.

‘He would bring character to the squad. He just wants to win games. If his team mate doesn’t play well, he will shout at them during the game and sometimes I think this is good,’ William told PlayOJO.

‘Sometimes, when I’m watching Arsenal, they don’t show any reaction when they concede, and someone like Costa will shout to the guys “Wake up!” which can boost the players.

‘If he comes to Arsenal, he will cause a lot of problems for defenders but it might also mean [Alexandre] Lacazette going on the bench again.’

The Gunners’ winning streak came to an end on Thursday night as the club were held to a goalless draw by Roy Hodgson’s Crystal Palace.

Arsenal were previously on a torrid run of form, but have picked up 10 points from their last four matches to lift them to 11th place.