Cameron Archer had opened the scoring for the hosts after just eight minutes before Joe Aribo slotted home the second to double the lead 20 minutes later.

But Facundo Buonanotte got Leicester back into the tie in the 64th minute, bundling home Abdul Fatawu's cutback.

Ten minutes later, Ryan Fraser saw red and conceded a penalty after holding back Jamie Vardy from poking over the line. The striker duly converted from the spot.

Ayew then completed the comeback in the 98th minute, driving a low shot into the bottom corner to seal a second consecutive win for Leicester.

Southampton is bottom of the table after failing to hold on to a point, while the Foxes move up to 13th.

Leicester has lost just one of its past five Premier League games after losing two of its first three under Cooper.

"We just need to stay humble because we were losing 2-0 so all is not perfect," matchwinner Ayew said.

"It's not going to be every weekend like this, it's going to be tough. But we have a quality group, we believe in ourselves, we believe in our manager. We are going to give our best for the club."

Frustrated Saints boss Russell Martin said: "The sending off changed the game. They hadn't had any of the ball near our goal at that point. Then Ryan gets sent off and it becomes really difficult.

"We played some brilliant stuff in the first half-hour but didn't take our chances to kill the game off. Someone gets sent off, it changes the whole context of the game.

"With VAR, I can't have any complaints, they obviously analysed it and looked at it."