Len has been head judge on the dancing competition since it first aired back in 2004, but after fourteen series, the 72-year-old has decided to call it quits.
He confirmed his exit in July, and now, Len has said he is "sure" he'll be regretting his decision when Strictly starts back up again next year.
Len addressed his decision to leave Strictly during an appearance on This Morning and said: "I just felt this is a good time to hang up my dancing shoes and pursue other things, if they turn up...
"Listen, I'm sure when I'm sitting at home next series watching it on TV, I'll turn to my Sue and say, 'Why didn't I do it? I could have done that.' I'm sure I will miss it.
"However, you make a decision and it's the right decision at the time. For me, I'd much rather go and people say, 'Oh Len, it's not going to be the same,' rather than, 'Thank heavens that old boy has gone, he was getting dithery.' You've got to know when to hold them and fold them."
Len also shared his thoughts on the celebrity contestants currently dancing on this series of Strictly, and he admitted he can't call it when it comes to picking a winner.
Former Hollyoaks star Danny Mac and Louise Redknapp have been tipped for a win, but Len said: "Usually I think it should be a [certain person], but this year, should it be Louise? Danny? Ore [Oduba]? Claudia [Fragapane]? Judge Rinder?
"This is the first year, hand on heart, I'll say that whoever wins is alright with me. It's such a great series."
Len's appearance on This Morning came after viewers recently saw Ed Balls sent home from Strictly.
He had made it to week ten of the competition and had been this series' most controversial contestant. Ed has been up against it since the early stages of Strictly, with many claiming he shouldn't have got as far as he had in the competition. Others loved Ed's performances on the show and had been rooting for him to go all the way.
Len's thoughts? Ed was "so much fun", but his time was up.
"Poor old Ed! He was great you know," Len said. "He was so much fun! Us British, we love an underdog, but we get to a point when we know justice is more important.
"It would have been an injustice if Danny or one of those had left and Ed stayed."
I've had the most fabulous three months on Strictly and this week was definitely the right time for me to go. Thank-you all at @bbcstrictly— Ed Balls (@edballs) November 27, 2016
Ed found himself in the bottom two on Sunday night's results show (27 November) along with Judge Rinder.
Following his exit, he tweeted: "I've had the most fabulous three months on Strictly and this week was definitely the right time for me to go. Thank-you all at @bbcstrictly."
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