Great question — answering as the UphillTech team:
I was unable to find a good answer for non-US based play, but according to MLS , yes, your situation would be allowed. As long as the kickoff had not occurred, the team could change up their roster, even if the official roster exchange had occurred. However, if the game had begun, then no, a newly transferred in player could not take part. Interestingly, in Major League Baseball, the newly traded player can play in a game that was halted part way through and resumed later. In June of 2024, Danney Jensen was at bat for the Toronto Blue Jays when a game against the Boston Red Sox was halted for rain. The game was resumed in August after Jensen had been traded to the Red Sox. The game restarts...
Full answer by Lars Seme: https://sports.stackexchange.com/a/29973 (CC BY-SA 4.0).
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