Renouf, 27, spent a majority of the 2020-21 season with the Colorado Avalanche, earning his first NHL action since making his debut with Detroit during the 2016-17 campaign. In 18 games with the Avalanche, Renouf recorded three points (0-3-3), 16 penalty minutes, 20 hits and 12 shots on goal in 10:10 average time on ice. He also appeared in five games for the American Hockey League's Colorado Eagles, tallying three points (1-2-3) and four penalty minutes. Originally signed as an undrafted free agent by the Red Wings on March 10, 2016, Renouf played 146 games for the Grand Rapids Griffins between 2015-18, helping deliver the franchise's second Calder Cup championship in 2017.
The 6-foot-3, 210-pound defenseman is a veteran of 279 AHL games between the Griffins, Charlotte Checkers and Eagles, totaling 72 points (10-62-72), a plus-44 rating and 390 penalty minutes. He's also added eight points (3-5-8), a plus-18 rating and 48 penalty minutes in 36 career AHL playoff games and became a two-time Calder Cup champion after helping Charlotte capture the title in 2018-19. A native of Ajax, Ontario, Renouf played three seasons at the University of Maine before turning pro at the end of the 2015-16 season, notching 38 points (10-28-38), a plus-14 rating and 72 penalty minutes from 2013-16. Renouf also logged two seasons in the United States Hockey League with the Youngstown Phantoms, registering 43 points (11-32-43), a plus-35 rating and 136 penalty minutes in 115 games from 2011-13.
Witkowski, 31, served as captain of the AHL's Syracuse Crunch in 2020-21, posting two points (0-2-2), a plus-eight rating and 32 penalty minutes in 14 games before his season was cut short due to injury. In 2019-20, Witkowski appeared in 12 games with the eventual Stanley Cup-champion Tampa Bay Lightning, logging three points (1-2-3) and 13 penalty minutes while adding six points (2-4-6), a plus-12 rating and 63 penalty minutes in 29 games with the Crunch. The Holland, Mich., native previously spent two seasons with the Red Wings from 2017-19, picking up six points (1-5-6) and 86 penalty minutes in 65 games. Over eight professional seasons, Witkowski has notched 13 points (2-11-13) and 162 penalty minutes in 131 NHL games between Detroit and Tampa Bay and 47 points (9-38-47), a plus-32 rating and 619 penalty minutes in 261 AHL games, all with Syracuse.