Muller, a 2014 World Cup winner working as a TV pundit alongside Jurgen Klopp during this year's tournament, posted to his story while in East Rutherford, New Jersey, for France vs. Senegal.
Muller added a goat emoji alongside the two-word post. The German legend and Messi have shared major stages for years, from the 2014 World Cup final to a 2025 MLS Cup meeting when Inter Miami defeated Vancouver Whitecaps.
Both remain in MLS, though cross-conference play means another head-to-head may only come through an MLS Cup rematch or Leagues Cup. Muller's contract expires at the end of the 2026 season, while Messi is signed with Inter Miami through the 2027-28 campaign.
