Chesterfield focused on title bid
The top-of-the-table Spireites booked their place in the Johnstone's Paint Trophy final on Tuesday evening, but Cook warned that the league is far more important for his side.
'We have to concentrate on the league now and we have a smashing day at the end of March to look forward to,' he said after the 1-0 second leg loss was not enough to deny his side a trip to the home of the FA.
"I want to back away from this myself because I think the players should take all the plaudits, we are top of the league and going to Wembley.'
Former Iron forward Jon Park gave Fleetwood the win on the night, but the Spireites progressed having won the opening leg of the tie 3-1.
Cod Army boss Graham Alexander hopes his side put the frustration of missing out on the final to good use as motivational tool for their own promotion push.
"It`s hurting for the players and for me because we would have loved to get to Wembley for everyone at the club,' he said.
"But we`ve got to make sure we have this pain inside us to drive us on to better things in the league.
'It`s a glorious failure which we don`t want. we want ugly wins and ugly success but if you are going to go out, this was the way to go out, we gave it right good go against a good team.'