Southampton now find themselves in a hard situation, three points from safety in the Premier League.
Despite today's scoreline, Arsenal have struggled in the Premier League this year, with the club now occupying 6th spot in the table. "At the start of the game I think people were impatient because we played against a very good team, but at the end of the game when it became more lively the team stood behind the team".
Mkhitaryan was hurt in the 61st minute of Arsenal's 4-1 win over the Russian side in the first leg of their Europa League quarter-final on Thursday.
Second half substitute Charlie Austin made an immediate impact as he came off the bench to draw Southampton level on 73 minutes but Welbeck nodded in the victor nine minutes from time.
A sparse home crowd bristled as their side laboured but Aubameyang hauled them back into the contest just before the half-hour mark, the finish on the stretch scruffy but the back-flick into his path from Welbeck inspired.
Danny Welbeck made it 2-1 for Arsenal in the 38th minute when he fired in from Iwobi's delightful pass.
"Clearly we've got talented players - you've seen that today - we just need that element of determination and ability to affect the opposition when the going gets tough". It was also Welbeck who provided a tremendous assist for Aubameyang's first goal.
However, we rallied once again and restored our lead when Welbeck headed home at the far post following an Iwobi cross in the 81st minute.
With six games remaining, Chelsea has fallen 10 points behind fourth-place Tottenham, which can now afford to lose half of its remaining Premier League fixtures and still secure a place in European soccer's elite competition. I know when I get the opportunity in front of goal I will put them away.