The defeat further dented Ronald Koeman side???s European hopes and they have now slipped to sixth in the Premier League table after Liverpool’s 2-1 win over Manchester City on Sunday.
Southampton now host Crystal Palace on Tuesday battling to keep pace with the Champions League places and Fonte wants a response.
“As a club we need to stick together because we’ve done fantastically until now and there are still 11 games to go. We all need to keep fighting,” he told the club’s official site.
“We need to look at the bigger picture. We’re still in a good position and there’s a lot to play for.
“We know where we want to be as a club, as a team and as a group of players, so Tuesday’s game is massive.
“We conceded another early goal and went the whole game trying to find the target and again we couldn’t find a goal.
“That’s something that has been happening for a while now, but we need to keep strong and believe in each other. Without putting too much pressure on the guys up front, we need to – as a team – pull through this.”