Brentford have completed the signing of Oldham defender James Tarkowski.
The 21-year-old centre-back has signed for an undisclosed fee on a three-year contract.
Tarkowski will be loaned back to Oldham when the loan window reopens in February as part of the deal.
He has made 36 appearances for the Latics this season after rising through the youth ranks at Boundary Park.
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