Dimitar Berbatov's strike against his former club proved the difference at White Hart Lane as the Cottagers capped an impressive performance with three points.
West London rivals QPR are next up after the international break and Dejagah is confident of another win.
"We're taking good form into the next match," he told the club's official website.
"We've got a break now as we go away for the internationals, but then we've got QPR which is another big game.
"We're playing at home and if we play the same as we did against Spurs, and the last few games, then I think we will win this match."