After the worlds, Wiffen will move his training basis back to Ireland after studying and swimming at Loughborough University.
He will split his time between Dublin and America, where his twins Nathan will move later in the year at the University of California, building to the next Olympic Games in Los Angeles in 2028.
The move also means the end of his successful collaboration with coach Andi Manley, and Wiffen says that he is undecided about who he will work in the next phase of his career.
But for now his focus is on the world championships, where he will add the 400 meters of freestyle to the 800m and 1500m with a longer distance.
Wiffen finished seventh in the 400m final in Doha before he won his two titles and admitted that “something in me has fueled”.
“I don’t want to get in seventh place, I want to win. I add it again, I’m going to try to improve seventh place as my goal.
“We will see how things are going. I hope for a medal in it. It will be difficult to swam it for a year now, but I look forward to it and the challenge.”
He added that the 400m would be treated as a “warming up” for the longer events, but he still strives for a stage finish.
“This is going to sound strange because I try to treat the 400m as a warming. Although I want a medal in it, we are talking about trying to get rid of that swimming for the 800m.
“Sometimes you need that start -up race to have a really good race in your second. For the 400m it is a warm -up race, but I will give it the honor and I try to win a medal.”
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