A player currently signed to a Championship club had to agree to a specific contract clause before he could sign for KSI's Baller League team.
Derby goalkeeper Harvey Rees made his debut for PRIME FC on Monday evening during their 7-1 win over Wembley Rangers, who are managed by Alan Shearer and Ian Wright.
His team-mates include Timmy Abraham, who is the brother of Aston Villa star Tammy, former Barnet and Dagenham & Redbridge midfielder Mauro Vilhete and ex-Love Island star Montel McKenzie.
Rees made history in becoming the first active EFL player to sign for a Baller League club - albeit the 18-year-old is only currently part of Derby's U18 squad.
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But unlike Baller League team-mate Sak Hassan, whose club side Wealdstone criticised his participation and said they had not given permission for him to play, Derby have given their blessing for Rees to feature in the 7-a-side tournament.
That's according to BBC Radio Derby, who report that the goalkeeper had to sign a medical waiver in order to play.
The exact details of the waiver have not been made public, but will likely protect the Rams in case Rees suffers an injury while featuring for PRIME FC.
The 18-year-old hasn't featured for Derby's reserve sides this season, and spent a short spell on a work experience loan at seventh-tier Southern Premier League South Division side Hungerford Town.
Players in the Baller League earn a fee of £400 per match, meaning Rees will be well-compensated for his appearances on top of his scholarship contract at Derby.
He is in the second year of a two-year scholarship deal at Pride Park.
Derby's U18 squad are coached by former Norwich and Blackburn midfielder Bradley Johnson, who made 140 appearances for the Rams during his spell at the club between 2015 and 2019.
Topics: KSI, Derby County, EFL Championship
Ryan Smart