Celtic midfielder Lewis Morgan has joined Sunderland on loan for the remainder of the season, the League One club have confirmed.
The 22-year-old Scotland international, who played for manager Jack Ross during his time at St Mirren, will be thrust into the thick of the Black Cats' bid for promotion back to the Sky Bet Championship.
Morgan said: "I'm joining coaching staff I've worked with before, and once I got the opportunity to speak with them, my decision was made.
"My game is based around scoring and creating goals, but I obviously also try to work hard for the team, and that is the most important thing.
"Something special is happening at the club this season and hopefully I can contribute to that."
Morgan began his career with the Bhoys' Glasgow rivals Rangers before joining St Mirren, where he helped the club win the Scottish Championship title in 2013.
He signed a four-year deal at Celtic 12 months ago and has played Champions League football and been capped at senior international level since.
Ross said: "I worked closely with Lewis for several years during my time at St Mirren and his progression at that time was terrific.
"I've been very open and honest with him about how hard he will have to work to get into our team as we have some very good players, but he's welcomed that challenge.
"He's still young, but he's an exciting player and I know exactly what he's capable of."
Meanwhile, Black Cats youngster Ethan Robson has joined Dundee on loan until the end of the season.
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