Barrie (531 NHL games played) and Ceci (487) bring some much-needed experience but it falls off from there. Marincin (216) has a limited amount, and Dermott (135), Holl (58), Sandin (seven) and Liljegren (none) are learning on the job.
Liljegren was a healthy scratch against the Devils. Those other six who did play left Keefe impressed.
"I liked our defense as a whole," Keefe said. "We got caught a couple of times today pushing the envelope [but] we'll learn from it."
Keefe has made it clear injuries will not be used as an excuse.
"The elite teams in the League don't get fazed by these types of situations and we want to be an elite team," Keefe said. "We believe we are an elite team and have the ability to take big steps as a group."
Sandin, Dermott, Liljegren, Holl and Marincin each played for Keefe with Toronto of the AHL, and each is well-schooled in how he wants his teams to play.
"Both Sheldon and all the players are comfortable with each other," Sandin said. "Me and Timmy, who just came up, we pretty much know everyone here, especially the D-corps. I feel we're very comfortable here with all the "D' and Sheldon."
The schedule is favorable for the banged-up Maple Leafs (25-16-6) to get much-needed rest and time to heal.
Toronto hosts the Calgary Flames on Thursday (7 p.m. ET; TSN4, SNW, NHL.TV) and the Chicago Blackhawks on Saturday before their League mandated five-day break before their break for the 2020 Honda NHL All-Star Game. They'll return to action at the Nashville Predators on Jan. 27.
As for making a potential move before the 2020 NHL trade deadline of Feb. 24, TSN reported Tuesday a number of teams have contacted the Maple Leafs about possible deals involving defensemen.
Adding a defenseman via trade is a viable option under the NHL salary cap because forward Ilya Mikheyev (wrist) is expected to miss the rest of the season on long-term injured reserve. Question is, can they get a team trading a $3 million player to eat half that salary-cap charge?
For now, they'll go with what they know. That includes Sandin, who was named top defenseman at the 2020 IIHF World Junior Championship after having 10 points (three goals, seven assists) for Sweden.
"He made an immediate impact on us [against New Jersey]," Matthews said. "I'm looking forward to watching him in the next game because it's a blast."