"ER" executive producer John Wells talks about the show's return and its final season.

"ER," currently in its 14th season, returns to NBC on Thursday, April 10th at 10:00 p.m., and this fall the long-running medical drama will begin its 15th and final season. As part of that, executive producer JOHN WELLS announced today that NOAH WYLE will be returning to the show next year for four episodes.

"He and I have always had a long-term arrangement that when the show was coming to the end that his character would return," Wells says. "Because [his character] has been off working in the volunteer and Doctors Without Borders world for a while that will be a part of his return."

But the most-asked question, according to Wells is: Will GEORGE CLOONEY reprise his role as Dr. Doug Ross?

"I love George Clooney. He is a friend of mine, but I would doubt very much that he would come back to the show," Wells reports. "A couple of other things have come up in his life."

Wells says that aside from Wyle, he hasn't approached any of the former cast members to return.

"We sit down at Memorial Day -- the whole writing staff -- we go to Hawaii and sit around and figure out what we will do for the next year," he explains. "Over the summer, I will start contacting people. Some will not come under any circumstances, but they are certainly going to want to know if we are asking them to come back, what we are asking them to do."

For those who don't return to the show, Wells is hopeful that they will want to take part in a tribute to the series, similar to the one that NBC did for "Friends" on the "Today" show.

"I hope they will be willing to talk about the experience," he continues. "I suspect people will be up for that."