Light was converted to a reliever last season and has one of the best power arms in the system.
The 24-year-old went 3-5 with five saves, a 3.88 ERA (27 ER/62.2 IP), .211 opponent batting average (49-for-232), .297 opponent slugging percentage, and 67 strikeouts in 47 appearances between Double-A Portland (21 games) and Triple-A Pawtucket (26 games) in 2015. Light held righties to a .186 average.
Jerez, 23, was named Red Sox Minor League Pitcher of the Year in 2015, combining with Class A Greenville, Class A Advanced Salem and Portland to go 5-3 with four saves and a 2.