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Gillingham's leading scorer has left the club following a recall.
Alex Jakubiak has seven goals to his name but hasn't started a league match since the start of November.
Premier League side Watford want the 23-year-old to play more and he has agreed a deal with Scottish side St Mirren for the rest of the season.
His departure also frees up a loan space in Gills' squad and could open the door for Wolves winger Jordan Graham, who has been linked with a move to Priestfield.
Boss Steve Evans has told supporters there has been in hitch in negotiations with an unnamed player, however.
A club tweet said: "Manager Steve Evans has informed us there is a possible hitch regarding a new signing.
"Negotiations are continuing with player representatives, Chairman Paul Scally, and the Manager himself."
Departing striker Jakubiak made 24 appearances for the Gills, half of those from the bench, but hopes of more action lessened following the arrival of John Akinde.
He was an unusued sub on Wednesday when Gillingham played Shrewsbury Town at Priestfield.
Manager Steve Evans said: "During the last couple of weeks I’ve had several chats regarding match minutes with Alex and Nigel Pearson at Watford.
“The summary was that I could not give any guarantees on this and Alex felt, with his contract up at the end of the season, it was essential for him.
“He is a quality player and will be a real asset for his next club. He goes with our best wishes. I really want the kid to be successful. He is a real professional and a real credit to Watford."
Jakubiak's exit follows that of defender Lee Hodson, who has moved on loan to St Mirren.
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