Declan Bonner was left to rue 10 second half wides after Donegal were eliminated from the Sam Maguire Cup race by a ravenous Mayo side on Saturday night.
"You can't afford to kick the wides we kicked in the second half and get a result at this level," the Donegal manager said after his side's four-point defeat in Castlebar.
"It is hugely disappointing. We have been scoring all season and they were decent chances - and not just one or two. We had a lot of wides in the second half which was disappointing.
“It is fairly raw at the minute and will be raw for a good few weeks.
“But we will get a chance to sit down and look back at it. The lads will be bitterly disappointed because we just didn’t perform, that is the bottom line and we are not going to make any excuses. We wish Mayo all the best in the All-Ireland semi-final.”