Sebastian Giovinco and Jonathan Osorio got on the scoreboard as Toronto beat the Fire 2-1 on Saturday in Chicago, snapping a six-game winless run.
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The Fire have been in need of a new right-back and Lichtenstein native Hasler should slot straight into the first team.
Toronto FC has suspended the privileges of all supporters' groups in the wake of a fire in the stands that disrupted Wednesday night's game.
Chris Schuler and Dom Dwyer scored as Orlando City held on to end a nine-game losing streak with a 2-1 victory over Toronto FC.
Jordan Hamilton's left-footed goal in the 69th minute helped visiting Toronto FC salvage a 2-2 tie against Sporting Kansas City at Kansas City, Kan.
Darwin Quintero scored the first hat trick in the short MLS history of Minnesota United, and the Loons held on for a 4-3 victory over Toronto FC.
A superb performance from goalkeeper Luis Robles allowed an early conversion by the New York Red Bulls to stand up in a 1-0 win over host Toronto FC
Jo Inge Berget scored twice as New York City FC began the era of coach Domenec Torrent with a 2-1 victory against Toronto FC on Sunday.
Two late goals from defender Nick Hagglund twice saved Toronto FC in a wild 4-4 draw against D.C. United on Wednesday night.
Jonathan Osorio scored in each half to help Toronto FC to a 2-0 victory over the Philadelphia Union at Talen Energy Stadium on Friday.
Atlanta United returned to the top of the MLS Power Rankings while reigning champions Toronto FC took another tumble.
Federico Higuain's penalty kick in the 90th minute capped an improbable comeback from a three-goal deficit when Columbus Crew extended their unb