The Bruins updated the status of David Pastrnak and Pavel Zacha and put another defenseman on injured reserve before Saturday’s game against the Red Wings at TD Garden.

David Pastrnak will miss his second straight game with an undisclosed ailment. Pavel Zacha is a game-time decision. Michael Callahan was called up to replace Henri Jokiharju, who was placed on injured reserve.

Boston had an optional morning skate at TD Garden between Friday afternoon’s loss to the Rangers and the second night of the back-to-back against Detroit.

Zacha was on the ice for the skate, but that didn’t ensure a return..

On top of that, Charlie McAvoy and Viktor Arvidsson both skated before the rest of the team, a first step toward a return for both injured players.

Jeremy Swayman will start in goal for t

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