The 25-year old midfielder has headed to the DW Stadium after making just nine Premier League appearances for the Hammers this season.
Latics boss Uwe Rosler sees him as a great addition to his squad which are currently placed fifth on the Championship table.
"Jack is exactly what we needed, he can play in a few different positions, has terrific experience of both the Premier League and the Championship and will heighten competition for places as we move into the crucial last few weeks of the season."
In addition, Wigan posted the following on Twitter:
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