Buyabu, who signed a new deal with the club in January, had gone on loan to Motherwell.
However, the loan has been brought to an early end, per The Star, as a result of off the field issues.
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The club have outlined that Buyabu is returning to Sheffield United for personal reasons.
The 20-year-old only played a single game for Motherwell as a substitute against Greenock Morton in the Scottish Cup.
He will now be hoping to kick on and get a loan move in the summer to get regular game time.