Former Premier League striker Michael Owen says he was shocked to see Chelsea dismiss Jose Mourinho.
Mourinho was fired by the Blues on Thursday, following a defeat to Leicester City, which followed up a home loss to Bournemouth.
Chelsea sit in 16th place in the Premier League table, one point above relegation, an awful position for the reigning champions to be in.
Owen is sceptical that long term, Chelsea will find a manager who is better than the 'Special One'.
He told SportLobster: "I know there's been plenty of rumours but still shocked to hear of Mourinho's sacking. Who is out there that's better!
"Could be a huge fight looming for Guardiola's services between Chelsea and the Manchester clubs!"
All three clubs will undoubtedly be interested in bringing in Pep Guardiola, expected to leave Bayern Munich when his contract expires in the summer.
The Blues have an advantage over their rivals in that they actually have a vacancy and can be open about their desire to land Guardiola.
United and City have to balance their overtures with respect to current bosses Louis van Gaal and Manuel Pellegrini, and not undermine the progress of the teams this season.