Bad day for Guardiola, even worse for Mourinho

behind after just 30 seconds when a range-finder from Marcos Alonso found Pedro in space behind United’s defence.

It set the scene for a woeful United defensive performance that angered Mourinho, who was forced to watch real excellence from the same Chelsea players who had failed to perform for him in the build up to his sacking last December.

‘‘We made incredible defensive mistakes and you pay for that,’’ said Mourinho, whose only previous Premier League experience of seeing his side leak in so many goals was when Chelsea were beaten 5-3 by Tottenham Hotspur in 2015.

‘‘If we score a goal like we almost did for 2-1 the game would be different,’’ added Mourinho, whose day was made worse by a serious knee ligament injury to defender Eric Bailly.

Thursday’s match should prove some managerial joust with Guardiola, who won their first Manchester derby, also sounding a mite desperate to get back on the winning trail again.

He knows how Mourinho feels, having gone back to Barcelona in midweek and suffered a similar 4-0 trouncing.

City had to come from behind after John Stones gifted Southampton the lead with a misplaced pass to Nathan Redmond. The draw, secured by Kelechi Iheanacho’s second-half equaliser, means City, who started life under Guardiola with 10 straight wins, have now not won for five games. It equals the Spaniard’s worst run as a manager when he was at Barcelona.