MLS concluded that Inter Miami broke the league's Designated Player rule in their signing of Blaise Matuidi last season.
The team could still face sanctions from MLS.
Matuidi, who was signed on a free transfer last summer, was initially categorized as a Target Allocation Money (TAM) player. His pay was above the limit for TAM players, and thus should have been categorized as a Designated Player.
The club already had reached the limit with three DPs by the time of the Matuidi signing.
Miami's three current DPs this season are Gonzalo Higuain, Rodolfo Pizarro, and Matuidi.
Former DP Matias Pellegrini was bought out of his contract and will join the club's USL League One affiliate this season.