Mikey Johnston has left Celtic to join West Brom on a loan deal until the end of the season.
The Republic of Ireland international has featured nine times for the Premiership leaders this season, scoring twice.
But the 24-year-old wanted more game time and heads to The Hawthorns as The Baggies push for a play-off spot in the English Championship.
Johnston's new head coach Carlos Corberán said: “At the start of the window we identified a need to increase our attacking options, specifically in wide positions.
“Mikey was one of our targets going into this window and we are delighted he is joining us.
“He is a player with European and international football experience as a winger and, if needed, he also has the qualities required to play as a number 10.
“Mikey has the skill to make a difference in the final third and the fact he has played regularly for Celtic in December and January means he will be able to make an immediate impact here.”