The Italian was very disappointed with the performance of his side, admitting they had 'not been competitive' in losing the Uefa Super Cup 4-1 to Atletico Madrid in Monaco
The Champions League winners suffered a dreadful 4-1 defeat to the Europa League holders in Monaco, with the Colombian striker scoring a stunning first-half hat-trick.
Di Matteo says his side did not deal with Falcao well enough and urged them to bounce back immediately after the morale-denting defeat.
“In the first half we were very poor, whereas Atletico were extremely sharp. We started very slowly and sloppily and they penalised us,” Di Matteo told ITV.
“In the first half we gave away three goals and you simply cannot do that against a team like Atletico Madrid.
“The effort was there, but they were just much better than we were. The players have a lot to learn – we have to get much better. It is a shame we cannot be competitive in a European final like this.
“We will continue to try and slowly change the team’s style, but we did not play well at all here.
“We will bounce back. It was a bad defeat but we have had some good days before this one.”
On hat-trick hero Falcao, who has been a Chelsea transfer target in the past, Di Matteo was unhappy with the way his defenders coped with the threat.
“We gave Falcao far too much space and time,” said the manager.
“You cannot give him any space because he is too dangerous. If you give him half a yard he can put it in the top corner.
“He did score a very good goal with the second one but we still should have blocked it before.”
The Blues will not get a chance to get the Super Cup defeat out of their system until they play QPR at Loftus Road on September 15, after the international break.