With the proviso that any head injury can be unpredictable, the early indications are that Frederik Andersen’s season does not appear to be in jeopardy.

The Maple Leafs No. 1 goaltender took a blow to his jaw from a player in Saturday’s 5-2 loss to the Sabres, a source told the Star. The source added that Andersen has since expressed optimism he’ll be available to play as early as Tuesday’s home game against the Panthers.

Garret Sparks was recalled by the Leafs in time for practice on Monday, and was working out with goalie Curtis McElhinney before practice officially began.

Andersen worked out in full gear around 10 a.m., an hour before the Maple Leafs were scheduled to take the ice at the MasterCard Centre.

The Leafs practised with three goalies. Sparks — recalled on an emergency basis — was also on the ice Monday, as was goalie Curtis McElhinney. Andersen worked out with goalie coach Steve Briere about an hour before practise, followed by Briere working out with Sparks and McElhinney.

Andersen, who was removed from Saturday’s game after the first period at the behest of the Sabres’ team doctor in a precautionary move that called to mind concussion protocol, has not complained of concussion symptoms since the injury, the source said. Which is not to say caution isn’t in order.

Andersen will undoubtedly be examined by a Maple Leafs team doctor today, when the team is scheduled to resume practice after taking Sunday off, and both sides will surely hope this isn’t an uncanny echo from last season, when Andersen suffered a March jaw injury that threatened to ruin his chances at the NHL playoffs.

A year ago this week Andersen, then a member of the Anaheim Ducks, took a speeding puck to the jaw in a practice — a shot that eventually triggered bouts of dizziness and affected his ability to track shots. That injury was announced by the Ducks as a concussion, although Andersen later told reporters that he didn’t believe he’d suffered one.

In any event, while Andersen initially attempted to play through the effects of that 2016 jaw injury, he was ultimately left unavailable for most of two weeks down the regular-season stretch. And while he returned to start Game 82, the Ducks began the playoffs with Andersen’s season-long platoon mate, John Gibson, as their starter.

The Leafs, of course, don’t have a goaltending alternative as accomplished as Gibson, although Toronto’s journeyman backup Curtis McElhinney has put up respectable numbers, including a .919 save percentage, in 10 appearances for the club this season.

With the Leafs clinging to a playoff berth, Andersen had been getting better at the right time. Heading into Saturday, when he stopped 14 of 16 shots before being pulled, Andersen had complied a 6-1-1 record while posting a .940 save percentage for the month of March. Playing at that level, he amounts to the most important single piece in Toronto’s stretch run and beyond.

A year ago around this time, Andersen eventually bounced back from his jaw-related setback with an impressive performance. After Anaheim lost its opening pair of playoff games with Gibson in the crease, Andersen got the nod in Game 3 and produced a 3-0 shutout win that suggested he’d overcome his injury while vaulting the Ducks back into the series. In all, Andersen started the final five games of the series, allowing a combined seven goals against as the Ducks were ultimately eliminated in a 2-1 Game 7 loss.

Andersen’s reputation for managing his position’s inevitable doses of hurt while weathering the post-season heat was surely among the factors that led the Maple Leafs to make the June trade that brought him to Toronto, where he promptly signed a five-year contract worth $25 million.

“There’s always pressure no matter what time of year,” Andersen was quoted as saying before his first playoff start of 2016. “This is the most fun kind of pressure. So I’m excited to play.”

The Leafs also called up forward Kasperi Kapanen from the Marlies Monday.

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The 20-year-old Kapanen has 43 points in 43 games with the Marlies. With injuries to Nikita Soshnikov and Eric Fehr, Kapanen is likely destined to fourth-line duty.

With files from Kevin McGran