Paul Lambert believes he needed more time to save Stoke City, although he concedes a lack of quality in attack also cost the relegated Potters.
Stoke's fate was sealed last week with a defeat at home to Crystal Palace, meaning a last-day 2-1 win at Swansea City counted for little - even if it dragged the Welsh club with them into the Championship.
"Fifteen games is never long enough," he told BBC Sport. "There were things wrong, without a doubt.
"I did what I think is right, but we drew games that we should have won. A little bit more quality across the top and we wouldn't be in this position. [In terms of] effort, I can't ask for any more.
FT: Goals from Badou Ndiaye and Peter Crouch cancel out Andy King's early opener as the Potters finish the season with a win. May 13, 2018
"I'm sure the club will know what is wrong and what is right. With that fanbase behind you, you have a chance.
"There's a core of players, but there's a turnaround that needs to happen. It's a really good core, if they have the right players that want to be at the club. I'm sure the club will learn from what has happened this year."
