The Nigerian player has signed a five-yr deal with Watford the Premier League club for a fee reportedly in the vicinity of £12.5million.
Isaac Success scored six objectives in 30 La Liga games last season,voted as Granada's player of the yr award.
The 20-yr-old becomes Watford's 3rd signing of the close-season, following Jerome Sinclair and Christian Kabasele to the club.
And the Hornets, now coached by means of Walter Mazzarri, are exceptionally good-stocked on the high of the pitch, with captain Troy Deeney signing a new five-year contract on Friday and studies of the club turning down a beneficial present for Odion Ighalo from chinese language super League membership Shanghai SIPG.
Mazzarri's guys the new optimum League campaign away at Southampton on August thirteen.