According to a statement from Fishel, it is unknown if other cast members from Boy Meets World will return for the new show. It was later announced in February that Michael Jacobs has reached out to all of the former Boy Meets World cast members and told each one of them that whoever wants to be part of the new show will be and those who don't want to be will not be.
Rider Strong along with Will Friedle made a surprise visit to the set during the filming of the pilot setting off rumors of a return or even a cameo in the upcoming series. Maitland Ward also made a visit to the set and was asked during a recent interview about the return of her character, Rachel McGuire. Ward said "I can’t really share any show info, but it would be fun if the old gang got back together again!"
Strong, who played Shawn Hunter in the original series, has denied involvement in the show, stating that: “Boy Meets World was a defining aspect of my life, and I cherish those seven years. So I am extremely happy for Ben and Danielle to be able to continue the story. At this point, I have no official involvement in Girl Meets World.” 
In June 2013, a reunion with many of the cast members from the original show happened with Michael Jacobs dropping hints on what has or will become of the Shawn Hunter character. Jacobs stated while Cory and Topanga will be figuring things out together, don't expect the same happy ending for Shawn and Angela. "Nothing good happens to Shawn, that’s all I can tell you," Jacobs laughed. "Rider reacting to the hurdles that keep growing is what I think is compelling about Shawn. Rider once said something -- and I really take to heart everything that these people say ‘I keep Shawn in the cellar, and every once in a while, I’ll go down and I’ll visit him.’ And I thought to myself, ‘boy, even Rider keeps Shawn in the cellar,’ so I think nothing good is ever gonna happen for Shawn."
When asked if Strong was returning to the series, Sabrina Carpenter said "I will say he definitely did come and visit, he’s very supportive". Jacobs was also asked about the return of Strong and Friedle if the show gets picked up and said "I think there’s more than a chance, I think there’s a strong chance." Teo Halm indicated that the people behind the show were keeping some things a surprise and when asked about the return of the Mr. Feeny character prior to the confirmation of his return Halm said "I honestly am not sure I can say" — and I'd say they're definitely keeping some things under their collective hats."