Collins, who has been impressive all season says that the poor defending for City's three goals were not due to individual errors but collective ones.
He told Footymad: "It is very hard to put a finger on our second-half display against Bradford as from the first half we were very solid but I don’t know if it was a lack of concentration or fitness but we seemed to get stretched far more and we were not as tight as what we should be.
"There was a period when they scored two in a few minutes and we were not concentrating enough and it was a collective error for the third goal and from there on in it was an uphill struggle."
The England Under-20 defender though says that The Owls will be up in the promotion shake up come the end of the season but admits that every game the club play from now until the end of the season must be judged as a 'cup final'.
He added: "Every single game we play at the moment is a massive game as we are simply not in the position we want to be and that is the top three.
"Bradford was disappointing for us not to win because of the hoards of fans that came up to watch us but you have to put that behind you, be professional and go for the next three points."