Watford have booked their return to the Premier League just nine months after they were relegated.
The Hornets follow in Norwich City's footsteps – with a 1-0 victory over Millwall on Saturday afternoon.
Ismaila Sarr was brought down in the box and converted a penalty in the 11th minute to grab his fourth goal in five matches and steer Xisco's men to victory.
With two games remaining in the season, Watford can still clinch the Championship title, although they will need Norwich to fail to win either of their two remaining games.
The Canaries beat Queens Park Rangers 3-1 on Saturday to maintain their five-point cushion at the table's summit.
Watford also boast the best defensive record in the Championship having conceded just 28 times in 44 outings.
William Troost-Ekong will be particularly pleased with his contribution in guiding the Hornets to keep a clean sheet in each of their last six home games – the foundation on which their promotion was built.
This article was most recently revised and updated 2 years ago