Gavin Rae believes he could have made a difference to Cardiff City's promotion chances had he been given the opportunity.
The Scottish international has spoken out against Bluebirds boss Dave Jones after playing only 16 minutes of football since the start of 2011.
And following Reading's second-leg victory against the Welsh side, securing a Championship play-off place against Swansea at Wembley, Rae is left frustrated at how close his side came to promotion.
Aberdeen-born Rae said: "I am gutted to be leaving and it was a frustrating season for me personally. I felt there were times when I could have played, even if it was to give others a rest.
"I was ready to play at any moment and in my heart I believe I might just have made a difference in some matches.
"One of my biggest regrets will be that I did not play a part in helping City earn promotion. We went so close over the last couple of seasons, but it wasn't meant to be.
"It was an up-and-down season in many ways. There were times when we looked really good as a team and then hit a bad patch.
"We were so close to automatic promotion, but in the end we didn't play well enough against Reading."
The 33-year-old joins several other out-of-contract players released by Cardiff this week, including Jay Bothroyd, Chris Burke and Martin John - while Adam Matthews has already agreed to sign for Celtic.
Rae will spend the next few weeks in Australia visiting relatives and will no doubt make a decision about where his future lies, with home-town club Aberdeen reportedly interested in the midfielder.
And while Rae departs the club, centre-half Anthony Gerrard is set to return to South Wales after being on loan to Championship rivals Hull City.
Gerrard, who joined Cardiff from Walsall in 2009, netted five goals in 42 games for Hull this season.
And despite the team earning only 14 points from their first 15 games, Gerrard enjoyed being part of a team who finished just outside the play-offs.
Gerrard said: "It was a fantastic season at Hull, even though we didn't make the play-offs. I think the club turned itself around with flying colours."
However, despite impressing Tigers boss Nigel Pearson, uncertainty surrounding the manager's position could mean the 25-year-old is now given a second chance with the Bluebirds.