The champions, who opened their title defence with a comfortable win at Arsenal last weekend, host the Terriers at the Etihad Stadium on Sunday.
City needed a late goal to beat David Wagner's men away last year and then could only manage a goalless draw against them on the day they were presented with the Premier League trophy in May.
'Last season was tough, those games,' City boss Guardiola said. 'They defended so well.
'They are so tough - physicality, defensively strong, good set-pieces, good throw-ins, good counter-attack, good high pressing.
'It was complicated last season and I imagine quite similar games.
'In this part of the season, all the teams, especially those with a lot of players at the World Cup, you need time - one month or a month and a half.
'In this period, these kind of games are so dangerous for the players. Games like this - and Wolves, Cardiff, Fulham - I prefer these teams in October/November.
'In this period the contenders, the big teams, history says always drop points. I remember last season we dropped points against Everton, and Bournemouth we won in the 96th minute.
'Always in this period games are so complicated. I guess it will be on Sunday.'