Chelsea are reportedly keeping an eye on Zenit St. Petersburg forward Mateo Cassierra, HITC Football understands. A recent report by HITC Football confirmed that Mateo Cassierra was one of the names offered to Chelsea in the January transfer window. The Blues have had an underwhelming start to their campaign despite spending big last summer on several players led byMoises Caicedo. Their forwards in particular haven’t kicked on with Senegalese striker Nicolas Jackson failing to impress at Stamford Bridge despite netting seven Premier League goals. Christopher Nkunku is also out with a hip injur…