Royal London Cup head coach David Harrison said it was frustrating his side failed to secure a spot in the knockout stages after Kent's dramatic victory over Lancashire.
The Welsh county began the 50-over campaign on a high but lost four matches in a row before rallying during the last two games of the competition. It looked as if the Welsh county would squeak through to the quarter-finals before Kent's final over win over Lancashire.
"I was checking the scores on my phone all afternoon and at one stage we were probably favourites with Kent and Yorkshire losing early wickets," said Harrison.
"We watched the last over of the Kent game, but we thought even if Kent lost we weren’t going to go through (on net run-rate). It’s frustrating after we finished the comp really well winning the last two, but we came up short in the middle four games."
Glamorgan were the defending champions in the competition but suffered injuries and late call-ups to The Hundred which meant Harrison's side was less settled than the previous year.
"We missed a few players from the first game when Timm van der Gugten, Jamie McIlroy and Chris Cooke started, Chris and Jamie got injured, and there was a lot more chopping and changing than last year when we had a settled squad of 14 players.
"This year there were a lot more changes with injuries, call ups and form so that took some juggling."
The LV= County Championship resumes in September with the Welsh county in the hunt for promotion to Division Two. They stand five points behind Middlesex, but with a game in hand, as the Londoners sit out the next round on 5 September before Glamorgan travel to Lord's for a crunch clash on 12 September.
Harrison believes the side's strong end to the Royal London Cup has given the Club momentum heading into the final month of the season.
"Winning the last two gives us a bit of momentum for the County Championship, winning’s a habit, the last game was against Worcestershire and we play them in the Championship in 12 days.
"The guys will be ready and refreshed, back from the Hundred, and it’s a big four games for the club with the chance of getting into the first division for the first time since 2005.
"We’ve got close to promotion on a couple of occasions since 2005, we’ve played some really good cricket in the last 10 games and given ourselves chances to win eight of them. If we can continue that, play well for the first three days and give ourselves a chance on the last day, we’ll have a really good opportunity."