Chelsea crashed out of the Champions League at the hands of Paris Saint-Germain on Wednesday night.
The Blues have come under-fire for their poor performance at Stamford Bridge, but Mourinho believes his side will prove their critics wrong by winning the title.
"The people that were out of the Champions League on Wednesday are the same people that won the League Cup and the same people that are going to win the Premier League," he said.
"The future now is to try and win the Premier League and if we finish the season winning the Premier League and the League Cup, then that is a brilliant season."
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Jose Mourinho is adamant Chelsea will win the Premier League
Chelsea hold a five-point lead over second-placed Manchester City with a game in hand ahead of Sunday's match at home to Southampton (1.30pm).
And Mourinho revealed he had discussed the Champions League failure with his players but refused to disclose what was said in a "good, interactive" meeting.
"We win together and we lose together," he added.
"We have 11 matches to play, We have an advantage of five points with a match in hand. We cannot promise we will win every game but we are optimistic."
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