#1 The squad players would be out to prove a point
Chelsea's participation in multiple competitions means that coach Sarri would make a priority of rotating his key players to avoid burn out towards the business end of the season.
The Blues have a very large squad, so this offers an opportunity for squad players such as Cesc Fabregas, Davide Zappacosta, Andreas Christensen and Alvaro Morata to get a run of games which would otherwise have been impossible were it not for the Europa League.
Most of Chelsea's second team are elite players who only find themselves on the bench due to intense competition for places, hence they would be keen to put up emphatic performances in the Europa League and give Sarri reasons to include them in his plans.
The determination to excel in the Europa League by the squad players is a factor which could propel Chelsea all the way in their quest for glory in the competition.