#1 Mohamed Salah
The player who inspired this list, Mohamed Salah is the most in-form player in the league right now. Currently the league's top goal scorer, as a winger no less, Chelsea don't need any more reminders about how they missed out with Salah after he scored against his former club recently.
With an amazing 17 goals in all competitions already this season, Salah has arguably been the signing of the season. After a successful period in Italy with Fiorentina and Roma, Salah has returned to England with a bang, silencing all of his doubters in the process.
The Egyptian would walk straight into this current Chelsea side, instantly improving them by replacing Willian or Pedro in the starting lineup. Imagine Eden Hazard, Salah and Álvaro Morata all up front for Chelsea today.
There is no doubt, just like many players on this list, Chelsea must be hurting seeing players they once owned succeed for rival teams and Salah is just the latest on that long list. A steal for Liverpool this past transfer window for just £35 million, Chelsea let him go for just £15 million a year ago.