Is this the final nail in Jose Mourinho's coffin as Chelsea suffer one of their most humiliating defeats of the season?
Fans on Twitter were upset with the referee but also bitterly disappointed with the performance of the Chelsea players.
Porto come to the bridge next. What can I expect now after tonight? #CFC
— Peter Szabo (@Bayron_41) December 5, 2015
Clear penalty not given and offside goal #CFC
— Jose Is A Winner (@CFCTOPOFTHEEPL) December 5, 2015
Dreadful Season #CFC
— AdelBrazil#CFC #ميﻻن (@NeymarElalam) December 5, 2015
That will be the end of jose.. #cfc
— Shane Levitt (@SL110587) December 5, 2015
Jose lost this game from the moment he decided not to start with a striker, a very silly decision!! #CFC
— Francis Dike (@Fsiix) December 5, 2015
This season is over anyway. Avoid relegation, regroup and go again next season #CFC
— Nathan Manning (@manning91) December 5, 2015
Chelsea have more chance of winning the lottery than winning the Premiership #CFC
— Dan Holloway (@RFCdan) December 5, 2015
— Zachary Fancy (@zfancy5) December 5, 2015
Jose is destroying CFC
— Zé Pequeno (@J_Roobs) December 5, 2015
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