Thomas Tuchel on Chelsea's defeat to Leeds, Edouard Mendy's howler and Kalidou Koulibaly's red card

Thomas Tuchel was left extremely disappointed after his Chelsea side were beaten 3-0 by Leeds United in the Premier League on Sunday afternoon at Elland Road. 

Brenden Aaronson, Rodrigo and Jack Harrison inflicted misery on Chelsea in Yorkshire as Kalidou Koulibaly was shown his marching orders when Stuart Attwell showed him a second yellow card for pulling back Joe Gelhardt. 

It was Chelsea’s first defeat of the season in the Premier League this season and it was one to forget. They missed crucial chances - Raheem Sterling had a brilliant opportunity inside the first minute, while Ruben Loftus-Cheek had a chance to fire goalwards. Illan Meslier made several good saves to ensure he kept his clean sheet intact. 

Tuchel believes his side lost the game in the first 20 minutes, telling BBC Sport: "We lost the game in the first 20 minutes, where we were clearly better and had huge chances. A lot of touches in the box but we miss the target and do not take what we deserve.

"We then stopped doing what we were doing good and it was even for 15 minutes and in those we gave two presents. We were clearly the better team. They do what they do.

"I don't see that a set-piece and (Mendy's mistake) are due to the style. They are mistakes. If we give goals away like this that are totally unnecessary and when we are totally in charge we cannot win football matches."

He added: "If we give goals away like this that are totally unnecessary and when we are totally in charge we cannot win football matches.

"We tried second-half and I am disappointed we lost that half as well. They made the maximum of their half-chances and we did not."

Edouard Mendy gifted Leeds their opener when Aaronson closed him down on the ball to tap into an empty net. It proved costly and the Senegalese knows how much of an error it was.

Tuchel said: “He knows himself. With these kind of mistakes, we don't have to speak a lot.

"It's a huge mistake in a crucial time in the match. It does not help and he's the one who is most disappointed.”

As the minutes ticked by and the full-time whistle neared, to the relief of Chelsea, their afternoon compounded and got even worse when Koulibaly was sent off, seeing him miss their next match against Leicester City. 

It was a short response from the Chelsea head coach, who concluded: "It is a bit of a reflection of frustration and it cannot happen. We cannot get frustrated in the Premier League. It is a pure joy to play games in an atmosphere like this. We should just do it and accept it. It is not okay and it is not good."

With the transfer window still open, there is still time for incomings. Tuchel commented on any potential signings: "We need to wait.

The transfer period is still open but it gets later and later. We need to focus on what we have and what we do.

"We can play at a high level but today we lost track when we didn't need to and it was going well.

"I still think we can win with this squad in Leeds."