Posting on Instagram, he produced a picture of himself playing for River Plate next to the forward with the simple phrase: “Admiration” the tag.
With his father apparently keen to re-sign the 28-year-old attacker, this has simply sent fans into overdrive believing a deal could yet be done.
Diego Costa has been unsettled at Stamford Bridge since the turn of the year, when rumours of a potential move to the Chinese Super League emerged.
Nevertheless, he played a leading role as Chelsea recaptured the Premier League crown, scoring 20 times in 35 top-tier outings for Antonio Conte’s side.
A move to Atleti, however, is blocked by FIFA sanctions that have prevented the Spanish club from registering new players until January.