The Colombian, who attracted the interest of Roma during the summer, settled Sunday's derby - but the Rossoneri's returning hero caught the eye with a scintillating cameo.
In the final days of the summer transfer window, Roma approached Inter about the possibility of signing Fredy Guarin. Nerazzurri sporting director Piero Ausilio's response was as swift as it was unequivocal: Guarin is unsellable.
That was hugely significant, given Inter was under pressure to offload players due to a summer spending spree coupled with Financial Fair Play regulations. Mateo Kovacic was allowed to join Real Madrid, while Hernanes was sold to Serie A champion Juventus on deadline day - yet Inter refused to even entertain the idea of cashing in on Guarin.