Chelsea have reportedly stepped up their interest in a £25m-rated attacking target by submitting a transfer offer. It doesn’t sound like Chelsea are slowing down their pace during what’s turning out to be a very busy summer window for the club. Now, the Blues are linked with signing a new forward. Nicolas Jackson, Christopher Nkunku and Marc Guiu appear to be the current genuine options in the striker position at Stamford Bridge. Speaking via Football.London last week, Enzo Maresca claimed Guiu’s likely to stay at Chelsea, so he’ll get his chance in the first team rather than going straight ou…