Arsenal attacker Theo Walcott admits former club Southampton are a threat to their top four hopes.
The Gunners overcame Leicester City 2-1 last night.
"I think it will be [tight], I think you can see every year the teams are getting better, who would have thought Southampton would be right up there, considering the players that left this season.
"I think it's going to go all the way, that's why it was so crucial to bounce back. The performance wasn't there but the three points was all we were determined to achieve. We'll focus on the FA Cup now."