Mourinho and the dreaded letter P
All Chelsea's league and cup defeats since the start of their 2014-15 title-winning season have come against managers whose surnames begin with the letter P.
One of those defeats came against Tony Pulis, whose West Brom side beat the Blues 3-0 at the Hawthorns in May. Pulis had also got the better of Jose Mourinho's men while in charge of Crystal Palace in March 2014 so on Sunday he will be aiming for a third win in a row over Chelsea.
Ahead of Sunday's clash with Tony Pulis' West Brom, here Press Association Sport looks at Jose Mourinho's troubles with Ps.
December 6, 2014: Newcastle 2 Chelsea 1
Papiss Cisse's goal inflicted Chelsea's third successive league defeat at Newcastle and left Mourinho still awaiting his first win in the competition at St James' Park.
January 1, 2015: Tottenham 5 Chelsea 3
The Blues conceded at least four goals in one match for the first time under Mourinho as Spurs troubled the Blues with pace and panache to help Manchester City draw level at the top of the table.
January 24, 2015: Chelsea 2 Bradford 4
Mourinho branded the FA Cup fourth-round exit to Bradford "unacceptable" and a "disgrace" as the League One side came from 2-0 down to win at Stamford Bridge.
May 18, 2015: West Brom 3 Chelsea 0
A side managed by former Crystal Palace boss Pulis got the better of Mourinho's Chelsea for a second successive season as Saido Berahino scored twice and Cesc Fabregas received a bizarre red card.
August 16, 2015: Manchester City 3 Chelsea 0
Mourinho called the result "completely fake" after Sergio Aguero's double in City's win. He substituted John Terry for the first time in 177 Premier League games.
Another one taking the P was...
April 19, 2014: Chelsea 1 Sunderland 2
Former Blues midfielder Poyet's relegation-threatened Sunderland inflicted Mourinho's first Premier League home loss in the 78th match. The Portuguese bemoaned the officials afterwards. It remains his only loss at Stamford Bridge in the league.
Not wishing to alarm you Jose, but....
The Hawthorns has been a bit of a graveyard for Chelsea managers. Two of the previous three incumbents left Chelsea within days of defeats suffered there - Andre Villas-Boas in March 2012 and Roberto Di Matteo eight months later.