The Italian, 69, hardly comes into a disastrous situation after the sacking of Xisco Munoz, with the club 15th and four points clear of the drop zone.
But the visit of Liverpool, and upcoming clashes with Arsenal and Manchester United, means there will be little time for Ranieri to settle down into his third stint in the Premier League.
For the Reds, memories of a 3-0 defeat in their last match with Watford, which followed a run of eight meetings unbeaten scoring 27 goals, must be put to one side as a victory will send Jurgen Klopp’s men top, if only temporarily.
Date, kick-off time and venue
Watford vs Liverpool is scheduled for an 12.30pm BST kick-off on Saturday, October 16, 2021.
Where to watch Watford vs Liverpool
TV channel: The match will be televised on BT Sport 1.
Live stream: BT Sport subscribers will be able to watch the match online via the website or the Sky Go and BT Sport apps.
Watford vs Liverpool team news
Trent Alexander-Arnold has returned to full training in a big boost for Liverpool, after he missed the matches with Porto and Manchester City with a groin injury.
James Milner could continue to deputise however, if Klopp rests his regular right-back for the midweek Champions League clash with Atletico Madrid.
Diogo Jota (knock) and Thiago Alcantara (calf) are doubts with the Portuguese forward released by his country midway through the international break. Harvey Elliott is a long-term absentee.
Fabinho and Alisson Becker will likely miss out having faced Uruguay with Brazil barely 36 hours before the lunchtime kick-off.
Watford are without Francisco Sierralta (hamstring), Peter Etebo (muscle), Christian Kabasele (hamstring) and Joshua King (knee).
Watford vs Liverpool prediction
A new manager bounce, coupled with a few key absentees for the visitors, could turn this into a memorable afternoon for Watford. But Liverpool have been in hot goalscoring form of late and should rise to this challenge.
Head to head (h2h) history and results