Former Hoops striker rejoins Shamrock Rovers after agreeing a deal that will keep him at Tallaght until the end of the 2013 season
The 25-year-old from Northern Ireland had a previous spell with the Hoops in 2010 when he picked up a league winners medial during his time at Tallaght.
He formed a formidable partnership with Gary Twigg and scored eight goals as Rovers won their first title in sixteen years.
Stewart began his career at Linfield before moving to Derry City where he was managed by current Hoops boss Stephen Kenny.
He has since played in Scotland for Partick Thistle where he spent just one season but managed to find the net on five occasions.
The Northern Ireland under-21 international comes straight into the Rovers squad for Friday’s trip to UCD.
Meanwhile, Derry City have confirmed that Eddie McCallion, who has made over 500 appearances for the Candystripes, is leaving the club and will join Irish league side Glenavon.
"I am sad to be leaving but am thankful to Glenavon for offering me a two year deal," McCallion said.