Bhoys reliant on rain and luck against Barca
The former striker put Celtic in front in the round-of-16 first-leg clash with the Catalans in February 2008, but Barcelona responded to win 3-2 and claimed a 1-0 home success to advance.
The Dutchman, who retired from football in May, said: “You have to be realistic. It’s going to be difficult, but at lot can happen at Celtic Park. Hopefully it will happen on Wednesday.