Firmino then turned provider just before the break, returning the favour to Salah, who finished with aplomb to effectively end the chances of a home side who got progressively worse after the break.
They have only won three league matches on their own patch this season, and only one team in the Premier League has won fewer.
Despite climbing the Premier League table after ending a 13-game win less streak in the league on Saturday, Southampton could still find themselves back down in the relegation zone before kick-off, highlighting the importance of trying to take points from every game we play until we're safe.
He said: "Southampton's win at West Brom last weekend was big for them because they had waited so long for a Premier League win - 12 games and 10 weeks to be exact - and this game is a hard one to call".
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"I enjoyed it a lot", Van Dijk said.
"We couldn't show what we are about, it was too much for us".
"If we were playing against towering defenders like Tony Adams and Jaap Stam and you were taking a set piece, you'd say "keep it away from him" or take the man away. I think we deserved the three points, [we got a] clean sheet, no injuries - [it was] almost ideal". However, with the likes of Salah, Mane and Firmino in their ranks, I don't think we will outscore them but they do have defensive issues at times so I'm going to go with a 2-2 draw!