Zboril, 23, had been on loan to Brno Kometa in the Czech League and has skated in two games with the club so far in the 2020-21 season.
Zboril skated in 58 games with the Providence Bruins in 2019-20, tallying three goals and a career-high 16 assists for 19 points with a plus-20 rating. He finished the season ranked second among the team's blueliners in scoring and third on the team in plus/minus. The 6-foot, 200-pound defenseman has played three full professional seasons with Providence, totaling 11 goals and 46 assists for 57 points with a plus-35 rating. He also appeared in two career NHL games with Boston in 2018-19.
The Brno, Czech Republic native was originally selected by Boston in the first round (13th overall) of the 2015 NHL Entry Draft.
McKegg, 28, skated in 53 games with the New York Rangers in 2019-20, tallying five goals and four assists for nine points.
McKegg spent the 2018-19 season with the Carolina Hurricanes, posting six goals and five assists for 11 points in 41 appearances. The 6-foot, 192-pound forward has played in 185 career NHL games with New York, Carolina, Pittsburgh, Tampa Bay, Florida and Toronto, totaling 18 goals and 15 assists for 33 points. He also has two goals in 18 career postseason games.
The St. Thomas, Ontario native was originally selected by the Toronto Maple Leafs in the third round (62nd overall) of the 2010 NHL Entry Draft.
Booth, 23, split time last season between the Charlotte Checkers of the AHL and the Greenville Swamp Rabbits and Atlanta Gladiators of the ECHL.
The 6-foot-3, 187-pound goaltender has appeared in 15 career AHL games with Charlotte, compiling a 7-4-0 record with a 2.54 goals against average and .902 save percentage. He has also played in 60 career ECHL games, posting a 36-19-4 record with three shutouts, a 2.66 goals against average and .908 save percentage.
The Montreal, Quebec native was originally selected by the Carolina Hurricanes in the fourth round (93rd overall) of the 2015 NHL Entry Draft.