Caley Thistle top the Scottish Premiership table with 13 points from a possible 15 and only Celtic have managed to score against them.
And Foran had not imagined such a start to the campaign.
"You're never sure," said the Irishman, whose team face Kilmarnock at Rugby Park on Saturday.
"Although you are winning games and scoring lots of goals in pre-season, you are not sure until you are playing SPFL games if the new lads will be up for it.
"They have showed they are, James Vincent and big Deano in goal are able to play this standard of football.
"We are a little bit surprised but we have a good quality squad, mostly British and Irish players which helps.
"The attitudes are tremendous day in, day out. All the boys on the bench are right up for it and keeping us on our toes, that's for sure."