Watford have replaced manager Billy McKinlay after two games and eight days with former Chelsea midfielder Slavisa Jokanovic.
The Scot had an unbeaten record in the two Championship games he was in charge of, winning one and drawing the other.
However, the Italian hierarchy at the Hornets have decided to take action with owner Gino Pozzo telling BBC Sport the move was in the "long-term interests" of the club.
Fourth manager in 37 days
The Serbian becomes Watford's fourth manager in just 37 days after McKinlay replaced Spaniard Oscar Garcia, who left the club due to health reasons.
The manager who started the season was Beppe Sannino, who quit on 31 August.
46-year-old Jokanovic won back-to-back titles with Partizan Belgrade in 2008 and 2009 and arrives in England from Spanish side Hercules.
McKinlay managed Watford in the 2-1 win over Brentford and Saturday's 1-1 draw with Brighton and he leaves the side third in the Championship, level on points with the top two.
Jokanovic was signed by Chelsea from Deportivo in 2000. He was a Yugoslavia and then Serbia & Montenegro international midfielder, picking up 64 caps.
He played 53 games in two seasons at Stamford Bridge and retired shortly after, going on to become Partizan boss in 2007.
Jokanovic will have at least a week to get to know and work with his players due to the international break, and I'm sure they will be raring to go again for their next fixture away at Sheffield Wednesday on 18 October.
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