The capital outfit have lost two of their last three games in the league having previously boasted a 31-match unbeaten run in all competitions.
However, the Croatian is confident that his side will return to form against Borussia Dortmund in the quarter-finals of the Champions League.
"Until those two recent matches we were having a fantastic season. We are still the same players and the same team," Modric told reporters at a press conference.
"We are very motivated for the upcoming matches, we have forgotten what has gone on before and we are concentrating on Dortmund.
"We haven't lost our confidence and I am convinced we will give our best tomorrow."
Dortmund knocked Madrid out in the semi-finals of the competition last season.