The San Jose Sharks finished up their preseason schedule on Saturday night against the Utah Mammoth in Salt Lake City.

For the first period, it looked like the Sharks didn’t really want to be there.

The Sharks allowed four goals on seven shots in the first period and trailed by three before Tyler Toffoli, Barclay Goodrow, and Will Smith all scored in the second period, with Smith’s power play goal tying the game at the 13:39 mark.

The Sharks, though, could not slow down the Mammoth in the third period, allowing goals to Clayton Keller and Brandon Tanev in a 6-4 loss at the Delta Center.

The Sharks dressed mostly an NHL-caliber lineup in their final tuneup before the start of the regular season on Thursday at home against the Vegas Golden Knights.

Saturday’s lineup included center Macklin Celebrini, who made his preseason debut after he was unable to play in the Sharks’ first five exhibition games as he recovered from an undisclosed ailment that he sustained at the start of training camp.

“I wanted to be with the team the whole time, and for whatever reason, it got taken off course,” Celebrini said Saturday morning in San Jose. “But now I’m back and excited to play.”

Celebrini, who led the Sharks with 63 points in 70 games last season, started Saturday’s game on a line with Will Smith and Philipp Kurashev. Celebrini and Smith were on the same line for several games last year and lined up with Kurashev during a recent practice. The Sharks signed the versatile Kurashev to a one-year, $1.2 million contract on July 1 after he had 130 points in 317 games over five seasons with the Chicago Blackhawks.

Sharks coach Ryan Warsofsky said he was going to monitor Celebrini’s ice time as he played his first game since May, when he was with Team Canada at the IIHF World Championship in Europe. Celebrini had been held out of contact drills until Wednesday of this week .

“We have a pretty good plan of where we want him to finish at, and we’ll see,” Warsofsky said. “He’s going to be champing at the bit to probably play 45 minutes, but that will not happen.”

The Sharks must reduce their roster to 23 players by Monday at 2 p.m., and one of the bigger questions general manager Mike Grier and the Sharks have is whether to keep Michael Misa and fellow top prospect defenseman Sam Dickinson for at least the first part of the season. If they do, more players will likely need to go on waivers, with forwards Pavol Regenda, Egor Afanasyev, and Carl Grundstrom, as well as defenseman Jack Thompson, among the possibilities.

NHL teams have 24 hours to claim anyone placed on waivers. If a player is not claimed, he can be assigned to the club’s AHL affiliate.

“We’ll play it out,” Warsofsky said. “We’ve still got a couple more days here to make these decisions. (Grier and I) have talked in depth about a lot of our guys and where we see the roster shaping up, and we’ll continue to work on it. You never want to lose players, but that is the nature of the business.”

Dickinson and forward Ethan Cardwell were among the small group of players who were playing for the second straight night after the Sharks beat the Vegas Golden Knights 4-1 on Friday at T-Mobile Arena. Cardwell had a hat trick, with all of his goals assisted by Pavol Regenda, who also assisted on a goal by Afanasyev.

Cardwell, who played six games with the Sharks last season and was the Barracuda’s fourth-leading scorer with 48 points in 63 games, has caught Warsofsky’s eye, not only with his scoring touch but with his play away from the puck.

Now entering his third year as a professional, Cardwell, 22, does not need to go on waivers to be sent to the AHL. But even if he does not make the Sharks’ season-opening roster, he could be one of the first players called up if injuries occur.

“He’s had a good camp,” Warsofsky said. “He scored three goals (Friday), but he was also really good on the penalty kill.”

Waiver wire: The Sharks placed forward Colin White on waivers Saturday. White, 28, was injured during camp and did not skate with the team. He was signed to a one-year, two-way contract in July after he had 25 points in 48 games with the Barracuda last season.