"It is not the same when the manager is five years as two years (into a job)", he added. "What I want is we stay together this season and next season, but I don't know what's the best for him".
No talks have yet been held with City chiefs, but Guardiola said: "I'm so comfortable working with this club".
Guardiola was without Sergio Aguero who has been ruled out for a couple of weeks by a thigh muscle injury and City missed his predatory instincts as they failed to make almost 80 per cent possession count.
"I think we played at a good, good level in all terms, defending and set-pieces and everything". After that we'll see how everything goes'. But it is not simple like I want to extend.
"We have another opponent in front of us, so we now have to try to win games, win games and see what happens".
Guardiola, whose side won their last 14 games last season to clinch the Premier League crown after a 2-1 defeat on Tyneside said: "Last season, we played badly, we played poorer than today".
"We have made enough points in the league but one team has not dropped points and Liverpool doing incredibly. We have to win games, win games, win games, and when you don't win, it will be more hard".
"Unfortunately, we could not score [enough to win]".
Guardiola's side have drawn one and lost three of their opening 13 Premier League games this season and they will be eager to claim the three points this weekend as the hectic festive period looms large.
This season has not gone according to plan for Guardiola as he attempted to match the unprecedented efforts of a year ago when he swept all three domestic titles.
Back-to-back Premier League winners Manchester City have had their backs to the wall for weeks now, as Liverpool took an early lead atop the table, looking for their first-ever Premier League-era title.