Overconfidence will be to blame if England fail to reach Euro 2008, says Croatia coach Slaven Bilic.
Bilic says McClaren should continue in his role as England coach
If Russia win in Israel on Saturday, Steve McClaren's team will be all but eliminated from next summer's finals in Austria and Switzerland.
But Bilic, whose team are top of Group E and play England next Wednesday, told BBC One's Football Focus: "The group was difficult.
"Maybe your approach was a little bit too self-confident in this campaign."
England were placed in their perilous position after losing 2-1 to Russia last month in Moscow.
Former Premier League player Bilic believes England underestimated the other teams in their group.
It's not Steve McClaren's fault and I really feel for him and hope he is going to continue
Croatia boss Slaven Bilic
"Because it is not easy to come to Croatia and to get something from a game," he added. "It is not easy to play in Russia. It is not easy to play Macedonia.
"And it's very difficult to play in Tel Aviv. So maybe you were expecting you were to cruise the group, but it's a very difficult group."
England manager McClaren is fighting to save his job, and the former Middlesbrough boss will come under enormous pressure should England not qualify.
But Bilic said: "As a club manager you need a couple of years to make or build a team.
"In a national team you need three or four years because you do not have them every day. You have them once a month for five days.
"It's not Steve McClaren's fault and I really feel for him and hope he is going to continue."
Watch the full interview with Slaven Bilic - Saturday, 1210 GMT, BBC One and BBC Sport website (UK only)