Splatt, 16, is a second-year scholar and joined the Rams academy in the summer, making nine appearances for Derby's Under 18s team.
He has also made one appearance for the Under 23s, coming off the bench to score in a 4-1 victory at Bristol City in the Premier League Cup.
Splatt has been brought in for the final seven games of the season to aid Mickleover's fight against relegation from the EVO-STIK League Premier Division.
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