It is likely to be a loan with an option to buy in the summer for the Republic of Ireland youth international, who is set for a medical, says The Sun.
Sotona was regarded as one of the fastest players at Manchester United's academy during his time there and has impressed Bees staff during a recent spell training with the club.
United have also left glowing reviews of the starlet who was at Old Trafford until 2020, where he once clocked a top speed of 22.9mph during sprinting sessions.
He moved to France from the Theatre of Dreams back in September 2020.
But now he is on the verge of return to England as Brentford's second deadline day signing.
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