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Mourinho said that unlike Bundesliga, were the giants buy all the good players from their rival teams just to kill competition, he cannot do the same here in the English Premier League due to the fierce competition.
Bayern Munich are known for flexing the financial muscle power every season and buy the best of players from their rivals and win the league almost every year.
Mourinho was quoted saying: "That is the new football. When previously you were speaking about Sir Alex Ferguson's time, this is not Germany.
"In Germany, Bayern Munich start winning the league in the summer. They go to Borussia Dortmund every year and buy their best player.
"One day they go there and get Robert Lewandowski. The next year, they go there, Mario Gotze. The next year they go there, Mats Hummels. So they win the league in the summer.
"Do you think I can go to Tottenham and bring two Tottenham players to kill Tottenham? I cannot. I cannot go to Arsenal and bring the two best Arsenal players. I cannot go to Chelsea and bring two of the players that I love very very much. That time is over.
"That time is over so the situation of starting being champion by attacking your direct opponents in this country is over.
"It is over and if you get a player from these clubs, you get a player that club does not want to keep. You cannot hurt anymore your direct opponents.
"Obviously Real Madrid sell who they want to sell, Barcelona sell who they want to sell, Bayern Munich sell who they want to sell, Paris Saint-Germain sell who they want to sell. So then it is more difficult to have a very good market."
Mourinho further mentioned that it is almost impossible for Manchester United to win the title this season but he believes his team can finish among top four and qualify for the Champions League.
The Red Devils take on defending champions Leicester City in a crucial game week 24 on Sunday, February 5.