Arsenal defender David Luiz will miss tomorrow's Europa League game against Rapid Vienna as he continues to recover from a head injury sustained against Wolverhampton Wanderers, the Premier League club have said.

The Brazil international clashed heads with Wolves striker Raul Jimenez in Sunday's league game.

Jimenez was taken off the pitch on a stretcher and later underwent an operation on a fractured skull while Luiz was allowed to play on with his head bandaged before being substituted at halftime.

"The cut to David's head will take some days to heal and therefore he will not be available for Thursday's match," Arsenal said in a statement.

"Close care of David's cut and general monitoring of his wellbeing will continue in the coming days and David continues to be in good health."

Arsenal also defended the decision to allow Luiz to continue playing against Wolves, saying "protocols were completed" with the player showing no signs of concussion.

Mikel Arteta's side have already booked a place in the Europa League knockout stages with 12 points from four matches in Group B.

Arsenal are in the same group as SSE Airtricity League side Dundalk, who face Molde in Norway looking for their first points of the campaign.

Arteta today also backed calls for concussion substitutes to be introduced in football.

"Some people can have the perception whether he should have continued or not," Arteta said when asked about Luiz.

"Thankfully we have one of the leading authorities (on concussion) in this country, which is Gary O’Driscoll, who is our doctor and has massive experience, not only in football but rugby as well.

"He knows exactly what to do. He did all the testing, he followed all the protocols and we were very comfortable for him (Luiz) to carry on playing.

"But obviously you have to make a decision in one minute, when somebody is bleeding, when you have someone with a massive concussion next to you – whose life is under threat."

He continued: "Maybe it is a moment that we can think to give these people a little bit more time and use a temporary substitution, for example, if we don’t want to find ourselves in those positions.

"But what I can tell you is everything was done in the right manner and the only aim here is to protect the welfare of the player – that is all.

"If you have any doubts at any moment and you need an extra two minutes or five minutes to check somebody – maybe we can think about that.

"The player wants to carry on playing and the doctor has to tick all the necessary boxes to be certain the player is OK to continue.

"So, if we have any extra doubts, OK we give them a little bit more time than necessary but you cannot play 10-15 minutes with 10 men in football."