Bellot, 26, is a third choice keeper for Bundesliga club RB Leipzig, where he’s made 27 appearances since 2009 and has also played for the club’s reserve team, RB Leipzig II.
The Union currently have three goalkeepers on the first-team roster with starter Andre Blake and backup John McCarthy. Jake McGuire was signed after trialing with the team in March and made his professional debut on Sunday for Bethlehem Steel FC.
McGuire was the second goalkeeper to trial with the team in the offseason after Indy Eleven goalkeeper Keith Cardona spent time with the team in preseason camp in Florida.
The Union have a direct connection to Germany through assistant coach Oka Nikolov, a former Bundesliga keeper who spent one season with the Union as a third choice keeper in 2013.