Finn was ruled out of the limited-overs tournament in India through injury and was forced to watch from the side-lines as his England team mates went on to reach the final.
The 27 year-old voiced his frustrations at the time, believing that his omission by England selectors had come prematurely.
However, the Middlesex bowler now regrets criticising the selectors’ decision to leave him out of the tournament.
“Trevor [Bayliss] sent me an email and said to use the frustration as motivation to take wickets in the summer,” Finn said.
“I think that was the perfect response to it because you can channel your frustration into the wrong avenues and it can affect you the wrong way.
“If it’s used in the right manner it can be a positive thing as well.
“It wasn’t as big an issue as it was made out to be. I missed the World Cup because I was injured, I was disappointed which got portrayed in that interview I suppose in a bit of the wrong words.
“I was wrong, I accepted that and spoke to the people affected and everything is fine now.
“I spoke to the medical people, selectors, people who made the decision. It’s gone, it’s been and done now.”
Finn was named in England’s 13-man squad to face Sri Lanka at Headingley next Thursday, in what is the first of three scheduled Test matches against Angelo Mathews side.
The Middlesex bowler is likely to start, despite competition from Nottinghamshire’s Jake Ball, and Finn says he hoping to find some consistency against the Sri Lankans this summer.
“I’ve bowled some good spells and some not great spells this summer,” Finn said. (Courtesy Sky Sports)