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Paul Merson tips Unai Emery to play a three-man defence with David Luiz at Arsenal

Paul Merson believes Unai Emery is working towards playing a three-man defence at Arsenal following the arrivals of David Luiz and Kieran Tierney.

Luiz was a surprise signing from Chelsea on deadline day, while the Gunners also strengthened their left-back by landing Tierney from Celtic in a £25 million deal.

Tierney is currently injured while Luiz was an unused substitute in Arsenal’s 1-0 victory over Newcastle United at St James’ Park on Sunday.