So much for Sunday being an uneventful off day.

Flyers goaltender Michael Leighton underwent an MRI exam and several Flyers hopefuls were released during the team's first off day of the preseason.

Flyers general manager Paul Holmgren did not say much about Leighton.

"We are awaiting the results," Holmgren said in a text message. "We will know more tomorrow."

The team's No. 1 goaltender aggravated a lower-back strain Friday in a 4-3 shoot-out victory against the Maple Leafs in Toronto.

The 29-year-old, who signed a two-year, $3.1 million contract on June 30, strained his back while working out over the summer.

Bothered by the injury, Leighton was yanked after 65 minutes against the Leafs and replaced by backup Brian Boucher for the shoot-out.

Boucher is expected to take over for Leighton, assuming he is unable to compete.

Cut-down time. The Flyers reduced their training-camp roster to 37 players.

Eighteen of the 65 invitees to camp were assigned to the Flyers' American Hockey League affiliate, the Adirondack Phantoms. Five players were returned to their junior teams, while five others were released from tryout contracts.

The team assigned forwards Greg Moore, Luke Pither, Matt Clackson, Garrett Klotz, Pat Maroon, Tye McGinn, Zac Rinaldo, Andrew Rowe, Shane Harper and Stefan Legein and defensemen Chad Denny, Jesse Dudas, Cullen Eddy, Dan Jancevski, Logan Stephenson and J.P. Testwuide and goaltenders Nic Riopel and Brian Smith to the Phantoms.

Returned to juniors were defenseman Ricard Blidstrand (Regina, Western Hockey League), forwards David Labrecque (Shawinigan, Quebec Major Junior Hockey League) and Michael Chaput (Lewiston, QMJHL), and defensemen Brendan Ranford (Kamloops, WHL) and Tyler Hostetter (Erie, Ontario Hockey League).

Forward Michael Ryan and defensemen Ryan Lannon and Joe Piskula were released from their professional tryout agreements. Forwards Justin Dowling and Blake Gal were released from their amateur tryout agreements.

Contact staff writer Keith Pompey at 610-313-8029 or kpompey@phillynews.com.