London - League leaders Chelsea will turn back to domestic matters for solace this weekend following their dramatic and ill-tempered elimination from the Champions League by Paris Saint-Germain in mid-week.
After victory over Tottenham Hotspur in the League Cup final, Jose Mourinho's side looked poised to sweep all before them over the season's final weeks, only to tumble out of European competition on away goals after a fiery 2-2 draw at Stamford Bridge on Wednesday.
The conduct of Chelsea's players, who swarmed around referee Bjorn Kuipers as he sent off Zlatan Ibrahimovic, and their failure to overcome 10-man opposition saw them pilloried in the British press on Thursday.
They remain extremely well placed in the title race, five points clear of Manchester City with a game in hand, but Southampton will be eager to exploit any frailty - physical and psychological - when they visit the Bridge on Sunday.
"We have to pick ourselves up and go again at the weekend now," said Chelsea captain John Terry.
"There's enough experience in the squad to rally round and get everyone going again.
"We've got the Capital One Cup in the pocket and the Premier League is a massive one to go for. The manager said if we can win the Capital One Cup and the Premier League, it will be a very successful year.
"Southampton will come here playing on the front foot and if we're not at it, we'll drop points and slip away in the Premier League."
Champions City have already clawed back an eight-point deficit once this season and they can provisionally close the gap on Chelsea to two points if they win at second-bottom Burnley on Saturday.
But Manuel Pellegrini's side must also keep an eye on their rear-view mirror, with third-place Arsenal now only four points behind them after a run of four consecutive league victories.
Arsene Wenger's side host West Ham United on Saturday, bolstered by a 2-1 victory at Manchester United on Monday that took them into the semi-finals of the FA Cup.