The Messi Effect is now so strong that opposing coaches are looking to directly influence ticket sales to preserve home-field advantage in the wake of Lionel Messi’s transformational arrival to MLS.

A perfect 5-0 since the Argentinian star joined last month, Inter Miami plays the Philadelphia Union in the Leagues Cup semifinals on Tuesday. Messi’s immense appeal has compelled Union head coach Jim Curtin to plead with local fans not to resort to the resale market — and possibly create a pro-Inter Miami crowd at Subaru Park.

“Please don’t sell your tickets, no matter how much money they’re offering for them — please,” Curtin said.