"I am very happy to come here. The manager and president were very important in my choice," Niang told the club's website. (www.watfordfc.com)
Niang is Watford manager Walter Mazzarri's third signing of the January transfer window, following the arrivals of striker Mauro Zarate from Fiorentina and midfielder Tom Cleverley from Everton.
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(Reporting by Simon Jennings in Bengaluru; Editing by Greg Stutchbury)
