LONDON - Chelsea supporters are a "disgrace" for criticising Francesc Fabregas after Sunday's 1-1 English Premier League draw with Southampton, according to Jose Mourinho's 15-year-old son, Jose Mario.

An error-strewn performance from Fabregas prompted groans of exasperation on several occasions, as the Blues laboured to a draw at Stamford Bridge, with many more venting their frustration with the Spaniard on social media, reported Goal.com.

Fabregas tops the Premier League assist table by a distance, having laid on 15 goals for his team, but the 27-year-old's form has dipped since the turn of the year and he has registered just one assist in his last 10 matches.

"Why is everyone hating and blaming Fabregas for Sunday's performance? It was a team effort," Jose Jr, a youth-team goalkeeper at Fulham, wrote on Instagram.

"Fabregas might have not played as well as most expected but at least he kept fighting... Showed a lot of character, I've seen bad Chelsea fans but Sunday was the worst I've ever seen, Fans booing Cesc not singing at all, I completely agree with the chant, 'Mourinho's right, your fans are s****e!' Our fans are a disgrace!!!!"

Mourinho himself has criticised the Stamford Bridge crowd on several occasions this season, claiming he thought his side were "playing in an empty stadium" after a 1-0 win over Queens Park Rangers in November.

Jose Jr's Instagram page has since been taken down, but screenshots of the post have circulated online.

Chelsea stoked controversy earlier this week by posting images of Graeme Souness and Jamie Carragher arguing with officials on Instagram alongside the caption "For those with short memories", after the Sky Sports duo had criticised the conduct of Blues players towards referee Bjorn Kuipers against Paris Saint-Germain in the Champions League.