What are rules on loan players in Champions League?

Ethan Nwaneri could play against parent club Arsenal in this season's Champions League for Borussia Dortmund, where he is currently out on loan.

English winger Nwaneri, 19, is currently on a season-long loan with the Bundesliga outfit.

His loan and parent clubs face each other in this season's Champions League league phase on Tuesday, 24 November.

Unlike league rules in the English football pyramid, Uefa does allow players who are out on loan to play against their parent clubs when the two sides meet in European competitions.

That means Nwaneri could feature for Dortmund when they take on the Gunners.