According to The Echo...
He will become a Watford player officially on July 1, but Liverpool have had no contact from the Hornets since rejecting a £1.5m offer for the player back in January.
In the meantime, the Reds accepted a deal worth £4m plus add-ons from Bournemouth in April, only for Sinclair to show no interest in the move.
That fact is likely to form a significant part of the representations they will make to a Premier League tribunal, who will determine how much compensation Watford have to pay for the teenager.