The Belgium defender last week indicated he may look to leave White Hart Lane in the summer if they do not secure a place in the Champions League.
"We needed those three points, but we will have to improve because we are playing better sides in March," the 26-year-old said.
"It is not just Liverpool we are chasing; I think there are other teams who can drop down.
"We are just watching fourth place - it does not matter who we catch.
"It was not our best game (on Sunday) but we are back on track after losing to Norwich."
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