Mauricio Pochettino's men were thrashed 7-2 at home by Bayern Munich in their previous European outing and have won just two of their last eight games in the Premier League.
However, Pochettino was pleased to see last season's Champions League finalists get back to the standards he expects.
"It was an important result. One, for our confidence and two, for another three points in the table," said Pochettino, as Tottenham leapfrogged Red Star into second in Group B behind Bayern.
"We start to see it is only time that we need to recover confidence. We need to go step-by-step, being solid again to try to start to perform in the way everyone expects".