The right-winger has still to start a Premier League match but is in the XI for the UEFA Champions League Group A clash against the Bundesliga champions, with Scott McTominay making way in the only change from the weekend defeat to Brighton & Hove Albion.
It represents a major vote of confidence in the Uruguay international, who enjoyed a fine pre-season and has had three substitute outings for the Reds so far this term.
Ten Hag believes Canada star Alphonso Davies may be a real threat when getting forward down the left but the full-back could be tested by the South American's skills down the flank.