Chelsea suffered a 1-0 defeat to Sunderland in the Premier League on Sunday afternoon to continue their poor run at the Stadium of Light.

Sunderland made it four wins in six league matches against Chelsea, securing just their second league win this season to lift them from the bottom of the table.

Sunderland opened the scoring, which proved to be the only goal of the game, in the 36th minute through Enzo Le Fee, who converted his penalty sending Mike Penders the wrong way after Brian Brobbey was adjudged to have been brought down by Levi Colwill.

Chelsea were unable to find a way back into the game despite several changes from Blues manager Xabi Alonso in the second half, seeing them lose their final game before the international break once again.

The defeat sees Chelsea slip to fifth in the league after Liverpool's win over Crystal Palace. They will be disappointed not to have claimed all three points, while the sides around them, with Arsenal and Brighton & Hove Albion, extended their gap as the table's top two.

Here are five things learned from Chelsea's 1-0 defeat against Sunderland.

Going into the game, Sunderland had won one of their first nine league matches and had also failed to score at home in three league matches. Chelsea allowed them to improve on both parts by scoring and therefore winning.

Failing to score, let alone create many chances, against a side at the bottom of the league is unacceptable by any standards. Chelsea had no answers throughout. Too many touches, too little quality.

Chelsea allowed Sunderland to grow into the game, win duels, and get the fans onside, and ultimately did what they needed to do to get the three points to continue the Blues' poor form against the Black Cats.

Particularly in attack, Chelsea looked void of ideas. Morgan Rogers and Cole Palmer were very much off the pace on Wearside. Rogers had one of Chelsea's few and best chances of the game, but was only able to head Marco Palestra's cross wide from close range in the first half.

Estevao was brought on at half-time to try to give Chelsea a boost in attack, but he was unable to be influential in helping the visitors turn the game around.

Joao Pedro's absence is noticeable in attack. He is irreplaceable. It proves it with Alonso picking Neto as a false nine, rather than selecting Danny Welbeck or Emmanuel Emegha - the recognised no.9s - to start.

Josh Acheampong's unavailability due to a minor issue was a loss for Chelsea's defence.

As in September, when Chelsea went winless, Alonso's side now head into the November international break after a defeat. After a fairly positive month, aside from the dismal defeat to Tottenham, the Blues are back to the drawing board at their Cobham training base.

Sunderland offered Chelsea a chance to build momentum after the Manchester United win. Now they will have to try to restart it at home against Leeds on November 21.

Chelsea would have felt very aggrieved by Jarred Gillett. Cole Palmer was sandwiched by  Luke O'Nien and Jules Ahoka, but the penalty call was adjudged to have been outside of the box. Replays suggest that O'Nien committed his foul inside the box.

Several yellow cards were given in the first half, but on several occasions - including Palmer being fouled by O'Nien off the ball - Sunderland got away with obvious yellow card decisions.

With Sunderland getting their penalty call, which Colwill felt he was being pulled down rather than the other way around, Chelsea were on the end of what they felt were frustrating decisions.

The warning signs were there before Sunderland's opener. Levi Colwill struggled to deal with Brian Brobbey's sheer power. Brobbey missed a good chance after firing over, having got the better of Colwill and Wesley Fofana, then won the penalty, which Le Fee converted.

Whether the penalty call was correct or not, Brobbey was an absolute handful and got the better of the Chelsea defence. Colwill was also taken off at half-time by Alonso, also likely impacted due to being on a yellow card.

Without Maxence Lacroix, Josh Acheampong and Reece James, Chelsea look exposed and the partnership of Colwill and Fofana doesn't offer huge confidence.