Liam Rosenior's 23 matches in charge of Chelsea featured an instant impact followed by sharp decline.
When the 41-year-old arrived at Stamford Bridge, the club was on a four-game winless run in the Premier League, having picked up just three points from a possible 12.
Previous boss Enzo Maresca left his role on New Year's Day and while the managerless Blues kicked off 2026 with a 1-1 draw at Manchester City, led by under-21s coach Calum Macfarlane, the club's owners moved quickly to bring in Rosenior.
The former Hull City manager made the switch after a successful 63 games in charge of Ligue 1 side Strasbourg, which is part of the same Todd Boehly and Clearlake Capital-owned BlueCo multi-club ownership group that controls Chelsea.
He led Chelsea to eight wins and two draws in his opening 12 matches, with Rosenior's only defeats coming in both legs of their Carabao Cup semi-final against Arsenal.
But another defeat to the Gunners at the start of March, this time in the Premier League, sparked a dramatic downturn in form.
Chelsea went on to win just two of Rosenior's final 11 games in charge, culminating in a fifth consecutive league defeat without scoring at Brighton - which proved to be the Englishman's last act as Blues boss.
Chelsea's English head coach Liam Rosenior reacts on the touchlineGetty Images