Andreoff, 28, is coming off a standout season with the AHL’s Syracuse Crunch, where he tallied 26 goals and 29 assists for 55 points in 75 games, establishing career highs in all three offensive categories. He also finished second in the AHL with 150 penalty minutes.
Originally a third-round choice by Los Angeles in the 2011 NHL Draft, Andreoff has 13 goals and 11 assists in 159 NHL contests with the Kings, along with 56 goals and 71 assists for 127 points in 232 AHL games with Syracuse and Manchester.
Gabriel, 26, spent last season in the New Jersey Devils organization, registering two goals and four assists in 32 AHL games with Binghamton and two goals and two assists in 22 contests with the parent club.
A third-round choice by Minnesota in the 2013 NHL Draft, Gabriel has notched 28 goals and 26 assists for 54 points in 264 AHL games with Binghamton and Iowa. He also has five points (2g, 3a) in 38 career NHL outings with the Devils and Wild.
Prosser, 33, tallied one goal and seven assists in 31 games with the Iowa Wild. He also skated in 15 NHL games with the Minnesota Wild.
Prosser has appeared in 354 career NHL contests with the Wild and St. Louis Blues, compiling 10 goals and 37 assists for 47 points.
In his AHL career, the defenseman has tallied nine goals and 30 assists for 39 points in 127 games with Iowa and Houston, where he reached the Calder Cup Finals in 2011 playing for current Flyers assistant coach Mike Yeo.