Watford boss Oscar Garcia remains in hospital after suffering chest pains over the weekend, the club have confirmed
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Former Spain international Albert Riera has joined Championship side Watford until the end of the season.
The ex-Liverpool and Manchester City winger has agreed the deal following his release by Galatasaray in January.
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Watford have been fined £5000 by the Football Association after admitting a charge of misconduct.
The Hornets were accused of failing to ensure their players conducted themselves in an orderly fashion and/or refrained from provocative behaviour against Ipswich on December 21.