Joe Duggan (Reporter)
DIEGO Costa is embroiled in controversy once more after appearing to trip Iker Casillas during Chelsea’s 2-0 win over Porto.
Costa seemed to trail his leg, provoking a strong reaction from the former Real Madrid keeper as Chelsea progressed to the last 16 of the Champions League.
Costa was booked for the action although he embraced Casillas at the end of the game.
The Blues striker has come in for criticism for his form this season after scoring just four times.
