McPartlin, 42, has already been axed from hosting Saturday Night Takeaway and Britain's Got Talent while he enters rehab.
Sunderland University psychologist Dr. Helen Driscoll says it'll be very hard for December.
Fans on Twitter expressed their delight at Ant's return, with one saying: 'Looking forward till Saturday and the return of Ant & Dec's unbelievable show'.
According to The Sun, show bosses had been "weighing up" whether or not to continue with Ant and Dec's mini series "Saturday Knight Takeaway".
"We had them in behind the counter and they pulled a few pints".
PA FLYNET SPLASH NEWS SHAKE-UP Only Dec will present the remaining Saturday Night Takeaway episodes
ITV were apparently affected by the decision not to air last weekend's episode, with the broadcaster reportedly losing three million viewers after the show was replaced by The Voice on Saturday evening.
"The bond between Ant and Dec is clearly deep; it is enduring and long-term, and has developed in the public eye". They have both always wanted a family but anxious that it might not happen for them.
"In male alliances, a bond can become so deep and enduring that people may unconsciously perceive themselves in their friend, conflating their own sense of self and status with the other".
"But filming has stopped because Ant has stepped down from TV commitments this year".
PA Wire/PA Images Dec will present this week's "Saturday Night Takeaway" alone.
In order to help out Declan Donnelly, it is thought Scarlett Moffatt will have a bigger role on this week's show.