The Blues boss believes his players were tired after the international break and says qualification for the last 16 "is the only positive thing" on a tough nightJose Mourinho admitted Basel deserved their Champions League win over Chelsea, adding that he was relieved to qualify from Group F.
Mohamed Salah scored the only goal of the game three minutes from time as the Swiss champions leapfrogged Schalke into second place behind the Londoners.
The German club's draw with Steaua Bucharest ensured the Premier League outfit's place in the last 16, while Basel travel to Gelsenkirchen next month knowing a point will see them through.
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Chelsea failed to register a shot on target in a lacklustre display, but manager Mourinho refused to blame his players and felt fatigue played a major part.
The Portuguese went on to say he regretted not making more than one change following the victory over West Ham on Saturday.
"It was a deserved defeat, but because of other results we qualified. That is the only positive thing, now we have to get a result at home [Steaua] be first," the former Real Madrid coach told Sky Sports.
"I didn't like it from the first minute, when there was a defensive mistake immediately. The team only had a little bit of stability and control in the second half.
"The team was tired, they paid the price of the international 15 days. The arrival, the match that followed was crucial against West Ham, where the team played very well in an intense game, but today we paid the price because the players were tired.
"I'm not so sad with them, because I understand. The team was not fresh and maybe I should have made more changes, but there was a temptation to keep the same team because they played so well (at West Ham)."