Declan Donnelly will still be hosting but it hasn't been decided yet if it will be on his own or with another presenting partner.
This also means 'Ant & Dec's Saturday Night Takeaway' will not return until 2020 with a representative for the duo saying: "Production and filming for a 'Saturday Night Takeaway' series in February would normally have already started, and continue throughout 2018 and early 2019," the rep explained.
"Neither Ant and Dec nor ITV wanted to compromise the quality of the show, and therefore felt it was better to rest the series next year. They will instead bring the show back in 2020, bigger and better than ever."
McPartlin's recent struggles with addiction led to a car accident earlier in the year which saw him fined £86,000 and banned from driving for 20 months after pleading guilty to being twice the legal drink drive limit.
Ant also released a statement saying: "My recovery is going very well, and for that to continue having spoken to Dec and ITV, I have made the decision to take the rest of the year off. I'd like to thank both Dec and ITV for their continued support and I look forward to getting back to work in the new year."
Dec added: "Whilst I am obviously sad at the thought of being without my best friend in Australia this year, I am proud of the work Ant has been doing privately and I am fully supportive of his decision.
"I'm looking forward to us both being reunited on screen in 2019."