Arsene Wenger has praised his "dynamic and explosive" Arsenal side for thrashing Southampton 5-0 in their FA Cup fourth-round tie at St Mary's Stadium.

Theo Walcott bagged a hat-trick against his former side on Saturday, while Danny Welbeck struck a brace to help the Gunners reach the last 16 of the competition.

Wenger told BT Sport: "We were very dynamic, explosive and overall we had a good consistent performance over 90 minutes and everybody played well.

"Welbeck has been out for such a long time, I didn't expect him to score straight away and it shows the desire is there.

"People say I make changes but I bring in Walcott, Welbeck and (Lucas) Perez, all top quality players. After that I try to find the best balance for the team."

Wenger was forced to watch from the stands as he began a four-match touchline ban.