Sporting Digest: Football

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Watford have signed the 31-year-old French striker Xavier Gravelaine on a short-term contract from Paris St-Germain.

Charlton Athletic have signed the Finnish international goalkeeper Antti Niemi on a three-month loan deal from Rangers.

The Derby County midfielder Francesco Baiano has had his contract cancelled by mutual consent and is seeking a new club in his native Italy.

Jimmy Gilligan, the assistant director of Watford's youth academy, has joined Nottingham Forest as reserve team coach.