Johnson signed a one-year, $775,000 contract with Boston on Monday.
Johnson signed a professional tryout agreement with Boston on Saturday.
Johnson scored a power-play goal on two shots and added two PIM in Thursday's 5-4 overtime loss to the Kings.
Johnson scored a goal on three shots, dished an assist, went plus-2 and blocked two shots in Saturday's 5-4 overtime win over the Sharks.
Johnson scored a power-play goal on his lone shot in Sunday's 7-4 win over the Flames.
Johnson (foot) is off injured reserve and set to return Wednesday versus Minnesota, per Tracey Myers of NHL.com.
Johnson (foot) is expected to return to action Wednesday against the Wild, Tracey Myers of NHL.com reports.
Johnson (foot) is out Monday versus Vancouver, but he could return later this week, Charlie Roumeliotis of NBC Sports Chicago reports.
Johnson (foot) was placed on injured reserve Monday.
Johnson (undisclosed) will return against the Jets on Wednesday, Scott Powers of The Athletic reports.