A thigh injury has forced the Manchester City forward to miss the last four Gameweeks.
During his spell on the sidelines Aguero's ownership dropped to just 9.9 per cent following significant sales.
That marks him out as a major differential over the festive period.
Aguero's return to training is a major boost for third-placed City ahead of Saturday's home contest with Leicester City.
It remains to be seen whether the Argentinian, who has netted nine goals in 12 Premier League starts this season, will be deemed fit enough to start this weekend.
Fellow striker Gabriel Jesus (£9.6m) may retain the lone striker role against the Foxes.
He has scored every 90 minutes this season, faster than any player in FPL with a minimum of three starts.
By comparison, Jesus has averaged 163.6 minutes per goal.
That suggests Aguero may well prove decisive for both Pep Guardiola and FPL managers alike over the busy festive period.