The Eagles chief posted on his Twitter account that the south London club had completed the signing of the 24-year old Senegal international.
Souare reportedly travelled straight to London following Senegal's early exit from the 2015 African Cup of Nations to become Alan Pardew's third signing of the winter transfer window after the capture of ex-Newcastle United striker Shola Ameobi and promising midfielder Jordon Mutch from QPR.
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