The Spanish and Portuguese head coaches live in continuous confrontation. The two might not have the same tension as was visible during their spells at Barcelona and Real Madrid respectively but the rivalry goes on.
Manchester United's shock defeat to West Brom on Sunday handed their city rivals the league and with it, moving Guardiola ever closer to Mourinho's trophy cabinet.
The deficit is now just two but Mourinho can extend it back to three if his side secure an FA Cup triumph, the club's only silverware target for this year. Although to reach the final, they first have to beat Tottenham on Saturday.
However, for the two managers, a small consolation is the fact that they are among some of the most decorated technicians in football's history.
Guardiola is tied with Giovanni Trapattoni on 23 whilst Mourinho has the same number as Luis Filipe Scolari (25). Ahead of them is Scot Jock Stein (26), Valeriy Lobanovskyi (30), Mircea Lucescu (32) and Sir Alex Ferguson (49).