Rovers have won their last three matches as they head to Home Park this weekend to face the side sitting rock bottom of League One's early standings.
But McCann says there can be no complacency or belief that Rovers simply have to turn up to win '“Â and that goes for any game this season.
'I don't think there is much in this league,' McCann told the Free Press.Â 'There's not much between most of the teams.
'Sunderland have obviously got a huge budget and there's players in there that have been in the Premier League. They maybe a street ahead of everybody else.
'But apart from that I think everyone is on a level playing field.
'You can win on any given day, you can lose on any given day if your concentration is not right.
'We've got to make sure we're right more times than not, and we'll give ourselves a good chance.
'I think it's a level of consistency and concentration that teams are showing, especially the top teams.
'The Portsmouths, Peterboroughs, Sunderands - the level of consistency they show each week shows why they're up there, added to their quality.'
McCann believes that while Plymouth sit bottom ofÂ the table, the should not be underestimated, particularly as there is little difference between the current side and that which narrowly missed out on a play-off place last season.
He said: 'That is what we're wary about because the team is not too dissimilar to last year, particularly from midfield forward.
'They've had some changes at the back but we know their threat, with Joel Grant and Graham Carey, good players in this league.
'There's always players in this league that can hurt you.
'I know they're a bit fragile at the minute but having watched some of their games, having reports on them, they're a threat.
'They'e got one of the best players in the league in my opinion in Graham Carey, someone we'll be very wary of.
'But it's another game where we want to make sure we perform first and foremost.
'If we continue with the way we're going, which we won't be letting up on, we'll go there and hopefully approach the game like we have every other game
' We'll give them the respect they deserve but our focus is only on us.'