Gambrell was placed on waivers by the Blue Jackets on Wednesday, James Mirtle of The Athletic reports.
Gambrell signed a one-year, two-way contract with Columbus on Tuesday.
Gambrell (concussion) was placed on waivers Sunday, according to Chris Johnston of TSN.
Gambrell "won't be available for a while" due to a concussion, Terry Koshan of The Toronto Sun reports.
Gambrell inked a one-year, $775,000 contract with Toronto on Monday, per PuckPedia.
Gambrell recorded an assist in Saturday's 7-4 win over the Lightning.
Gambrell scored his second goal of the season in Tuesday's 2-1 loss to the Bruins.
Gambrell earned an assist against the Red Wings on Monday.
Gambrell logged just 10:24 of ice time in Sunday's 4-2 loss to Minnesota in which he recorded one shot, one hit and two blocks.
Gambrell secured a one-year, $950,000 contract from the Senators on Wednesday.