Napoli and Ross were Red Sox teammates in 2013 and 2014, winning a championship in that first season together. After a 12-year MLB career, Napoli retired in December 2018.
Napoli represents the third new coach added to the Cubs' staff, as Andy Green will be the bench coach and Chris Young will be the bullpen coach, per reports.
The Cubs have one spot left open on their staff -- either their first-base or third-base coaching job. They've already announced Will Venable will return to their staff in one of those two roles.