Barcelona's disgruntled fans had whistled their team against Slavia in midweek and when Olaza equalised for Celta, that tension and restlessness threatened to return.
"ARGs are not regulated in any way and are a challenging emerging contaminant of concern due to our reliance on biological treatment in the engineered water cycle."
"You cannot replace him individually, I think it's pretty much impossible because of the high, high level he is at now in his career."
The Belgian is widely expected to leave Chelsea for Real Madrid after seven years in England, and this was the perfect way for him to bow out."I think it is a goodbye, but in football you never know," the 28 year-old told BT Sport.