Andre Villas-Boas admits Tottenham will need to step up their game for the trip to Chelsea after watching his team edge past Southampton 1-0.
A win at Chelsea on Wednesday will put Spurs in pole position to secure a top-four finish but the manager knows they need to be sharper if they are to win their first game at Stamford Bridge for 23 years.
He said: "It will be extremely difficult, but if we achieve these nine points we will be enjoying Champions League football next season.
"That is our aim, but we understand that other teams are improving and it will probably go down to the wire.
"The three points gives us a wonderful opportunity against a team that is fighting for the same objectives as us."
"We didn't play well in the first half, but we deserved the points after what we did in the second half.
"It was not the 'Spurs way', but in the end it keeps us in the frame and hopefully we will improve, and play better against Chelsea. It's a big, big game."