When Flyers defenseman Travis Sanheim took a hit from behind from Matt Martin in Sunday's preseason opener, it was no surprise he was done for the day, at least as a precaution. But the nature of the hit left a sense of worry, potentially another injury the team had to deal with before the season even begins.

GM Ron Hextall provided an update on Sanheim on Monday, and the prognosis was fairly positive. Sanheim will miss one week with the injury, but that should not derail his progress for the start of the regular season, still a little over two weeks away.

It will cause Sanheim to be out of game action for the rest of the week, which still has four games on the schedule, including Monday night's game against the Islanders at Wells Fargo Center. There is a chance that Sanheim could recover and get into one or both of the final two preseason games on Sept. 27 against the Rangers and Sept. 29 against the Bruins.

Sanheim scored two goals and had 10 points in 49 games in his first season in the NHL in 2017-18. He figures to be a bigger part of the defensive group this season with the Flyers after a couple of season developing with the Phantoms.

In addition, Hextall updated the status of Andrew MacDonald, who skated along with Sam Morin before all three days of camp. MacDonald is ahead of schedule according to Hextall, which may mean he will not miss two weeks of the regular season as previously expected.

The Flyers continue the preseason on Monday night against the New York Islanders at Wells Fargo Center at 7 p.m.

Kevin Durso is Flyers insider for 97.3 ESPN and Flyers editor for SportsTalkPhilly.com. Follow him on Twitter @Kevin_Durso.