"One of the biggest losses that Chelsea have had is John Terry", Harris told Ian Stone's Comedy Breakfast (weekdays 6.30am-10.30am).
Asked if he feared for his job, the Italian said there was always pressure and a risk he could be sacked.
Understandably, Chelsea boss Maurizio Sarri was displeased with the performance and showed as much when he outright ignored a handshake from his counterpart Pep Guardiola before heading into the tunnel. I didn't see my football.
That established Aguero as City's record league goalscorer, surpassing the 158 goals of Eric Brook and Tommy Johnson, and he later extended his tally to 160 by completing his treble from the spot.
Last season was the first time in his career that Aguero was voted into the PFA team of the year, having been omitted in favour of players such as Romelu Lukaku, Daniel Sturridge & Jamie Vardy in previous seasons. Is history about to repeat itself a third time?
A 4-0 defeat to Bournemouth in their last away game was Chelsea's heaviest league defeat since 1996. If Sarri goes, whoever replaces him may have his work cut out.
"There still seems no logical reason why Jorginho is favoured as Chelsea's midfield anchor ahead of N'Golo Kante, arguably the best in the world in his position", wrote Phil McNulty of BBC Sports.
Chelsea slipped to sixth in the league table and are now level on points with Arsenal following their humiliation at Manchester City on Sunday.
According to The Mirror, that has resulted in the club's hierarchy being left unhappy with officials behind the scenes keen to see the winger be given opportunities in the first team. There are similarities between the way Sarri started with a bang at Chelsea and Guardiola at City, before problems set in, but the similarities end there. With a few Chelsea players surrounding him, Manchester City's all time leading scorer let out a thunderous right footed shot which went into the top corner. When Sarri was appointed last July, Chelsea director Marina Granovskaia said the club's hierarchy were "looking forward to him bringing his football philosophy to Chelsea". Motivation was not an issue.
Sarri has been given a stay of execution but faces a crucial 15 days.