Bayern kicked off their first pre-season friendly of the summer with a 3-1 over French champions Paris Saint-Germain in Niko Kovac's first game since taking charge of the side. Richards was initially named among the substitutes, but came on in the 62nd minute for Sandro Wagner with the score at 1-1.
He slotted in at centre-back and looked an assured presence on the pitch, helping to keep his American compatriot Timothy Weah quiet as Bayern increased the pressure in the closing stages to seal the come-from-behind victory.
Richards, who joined after impressing during a ten-day trial at the Bayern youth campus earlier this year, was one of nine players to make their Bayern debuts in the match against PSG, alongside Serge Gnabry, Josip Stanisic, Joshua Zirkzee, Jonathan Meier, Marcel Zylla, Ryan Johansson, Paul Will and Oliver Batista Meier.
The defender will now join the first team on their summer tour of the USA, which will include matches against Juventus in Philadelphia (25 July) and Manchester City in Miami (28 July). Richards is among an ever-growing number of young Americans to move to the Bundesliga, joining the likes of Christian Pulisic, Weston McKennie and Josh Sargent in Germany.