Might be difficult to turn into a chant, but Fab-re-gas fits so nicely into the chorus of Photograph by Def Leppard that it could form the basis for a chant:
Fab-re-gaaaaaas
He loves Chelsea
Fab-re-gaaaaaas
F*ck off Arsenal
Fab-riii-gaaaaaasss
We all love Cesc Fabregas
Any good?