Glen Johnson has questioned Arsenal's deal for former Chelsea defender David Luiz.

Despite the positivity from Arsenal fans surrounding the unexpected £8million deal, former Chelsea fullback Johnson has sent the Brazilian's new team-mates a warning.

“David Luiz is a winner, you have to agree. He's won all sorts of trophies throughout his career," Johnson told talkSPORT.

“But I think Arsenal need a backbone and I'm not so sure Luiz can bring that.

“He likes to play football, he enjoys the game and he plays it the right way but Arsenal need something solid and I don't think he's the man for that.

“He's great to watch, but playing alongside him he'd be one of those guys you have to be a yard closer to, just waiting for the unexpected to happen.

“Yes, he's great when it all comes off and he's playing with flair, but if I was playing with him you would have to babysit him a little bit.

“If you are his centre-half partner you'd have to babysit him more than you would do with somebody else."