Lugo, 28, finishes off a strong season with a 2.66 ERA, 3.17 FIP, 1.08 WHIP and 103 strikeouts compared to only 28 walks in 101.1 innings. He made 54 appearances including five starts and set a new career-high with a 2.2 bWAR.
It was reported on Thursday that Lugo will train as a starting pitcher over the offseason.
Gsellman, 25, struggled in his first season as a strict reliever with a 4.28 ERA, 3.94 FIP, 1.30 WHIP and 70 strikeouts compared to 28 walks in 80 innings. Gsellman seemed to run out of gas towards the end of the season allowing 10 earn runs in his last 9.1 innings.