Fikayo Tomori and Tammy Abraham joined Milan and Roma from Chelsea in the summer, but there is a slight difference in the deals that saw the two players move to Italy.
Tomori completed a permanent €28m move to Milan after a six-month loan spell at San Siro.
The English defender had scored one goal in 22 appearances across all competitions with the Serie A giants before his permanent move to Milan.
His compatriot Tammy Abraham joined him in Italy only a few months later, completing a permanent €40m move to Roma.
Fabrizio Romano confirms the Blues don’t have an option to re-sign Tomori in the future, while Abraham could return to Stamford Bridge if he impresses with Roma.
Chelsea have an option they can use until June 2025 to re-sign the English striker for €80m.
Real Madrid had a similar option to re-sign Alvaro Morata from Juventus in 2015. The Spaniard spent two seasons in Turin before the La Liga giants paid circa €30m to take him back to the club.
Abraham, 23, has scored two goals in five appearances with Roma so far this season.