A Study of Vedolizumab With and Without Upadacitinib in Adults With Crohn's Disease

The drug being tested in this study is vedolizumab. Vedolizumab is being tested to treat people with moderately to severely active CD. The study will look at the efficacy and safety of vedolizumab with and without upadacitinib. The study will enroll approximately 396 patients. Participants will be assigned in a 1:1 ratio to one of the two treatment groups in the 12-weeks Induction Phase: * Induction Phase: Vedolizumab + Upadacitinib * Induction Phase: Vedolizumab + Placebo Participants who achieve a Crohn's disease activity index (CDAI) reduction of greater than or equal to (\>=)70 points from baseline at Week 12 will enter the main study Maintenance Phase (40 weeks) of the study to receive vedolizumab monotherapy. Participants will be followed for a further 18-week safety follow-up period up to Week 70. This multi-center trial will be conducted worldwide. The overall time to participate in this study is approximately 70 weeks.