Celtic have signed highly-rated full-back Jeremy Toljan on loan from Borussia Dortmund until the end of the season.
The 24-year-old made 19 starts in his debut campaign at the Westfalenstadion but has been frozen out this season under Swiss coach Lucien Favre.
"This is an exciting move for me and I'm delighted to be joining a club like Celtic, which has a great reputation throughout Europe," Toljan told the club's official website.
"I'm looking forward to meeting my new team-mates and working with the manager, and I'll be doing everything I can to help the team to be successful in the remainder of this season.
"I can't wait to get started and give all I can for this great, iconic club."
Toljan becomes Celtic's second signing of Deadline Day, following Maryan Shved's move from Karpaty Lviv on a four-and-a-half-year deal.