Enzo Maresca has just made an interesting claim about Chelsea youngster Marc Guiu straight after the pre-season defeat to Celtic. Unfortunately, Chelsea suffered a disheartening 4-1 loss on Saturday night against Scottish champions Celtic. There’s so much more to the pre-season friendlies than results as the players get up to full speed, but it was a tough watch for the supporters. The Blues went 4-0 behind before Christopher Nkunku’s late penalty, which makes it two goals in two games for him so far on this tour of the United States. Marc Guiu, who’s aged just 18, led the line again for Chels…