Swayman stopped 19 of 23 shots in Tuesday's 4-3 loss to the Panthers.
Swayman opened the season with back-to-back wins while stopping 56 of the 58 shots he faced in that span, but the wheels have fallen off quickly. He is currently riding a three-game losing skid, a stretch where he's posted a 4.38 GAA and a subpar .866 save percentage. Boston hosts the Ducks on Thursday, and it's unclear if Swayman or Joonas Korpisalo will get the starting nod.