Watford boss Oscar Garcia is in hospital being treated for what the club describe as "minor chest pains".
The Spaniard, who took charge of his first match on Saturday as the Hornets were beaten 1-0 at Charlton, was admitted to hospital on Sunday evening.
Garcia, 41, is undergoing further tests on Monday and as a result will not travel with the Watford squad for Tuesday evening's Championship clash at Blackpool.
Assistant coaches Ruben Martinez and Javier Pereira will instead take charge at Bloomfield Road.
A statement on Watford's website read: "The club wishes Oscar a speedy recovery and will keep supporters fully updated about the head coach's condition."
Former Brighton boss Garcia only took over at Vicarage Road a fortnight ago following Beppe Sannino's departure from the club.
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