Leipzig are in fourth place on 36 points, three behind visitors Union, who have won more league matches this season than leaders Bayern Munich.
RB Leipzig named Marco Rose as new head coach on Thursday a day after sacking Domenico Tedesco.
Borussia Dortmund coach Marco Rose said Saturday that injured star striker Erling Haaland will remain sidelined for Sunday's game against Borussia Moenchengladbach.
Haaland is set to make a surprise return for Borussia Dortmund this weekend after a five-week absence with a leg injury.
Marco Rose says he will do everything to keep Bellingham and Haaland at the Bundesliga club as the young stars attract the attention of Europe's top clubs.