Southampton manager Mauricio Pochettino wants his team to carry on where they left off when they return to action after the international break on Saturday.
The Saints defeated Hull City 4-1 at St Mary's in their last outing on November 9 to extend their unbeaten run in the Premier League to eight matches.
They are currently third in the table but now face a major test against leaders at Arsenal at the Emirates.
Pochettino said: "We have to continue playing how we have been and applying the same level of effort.
"The Premier League is very competitive. Any team can beat any other team, and we have the belief that we can beat any side.
"I'd say the team we play on Saturday (Arsenal) is that one that's playing the best football in the league.
"Arsenal can win the league, but I think there are other teams that will be in the running. It'll be hard-fought."
Pochettino had three players on international duty with England - Rickie Lambert, Adam Lallana and Jay Rodriguez - and the trio should all be involved against the Gunners.
"I'm happy with their contributions - we're very pleased with them and proud of how they did," said Pochettino.
"Any experience our players garner with their international sides is going to be positive for us and a bonus for Southampton.
"Adam and Jay have returned motivated, and they're both excited to put their Saints shirts on and perform on Saturday."