Gilbert (elbow) is throwing a bullpen session Friday, and if all goes well, he will make his next start with the Mariners, Daniel Kramer of MLB.com reports.
Gilbert made three rehab starts and is currently with the team at T-Mobile Park on Friday. If he doesn't endure a setback during Friday's bullpen session, he would be in line to make his return to the rotation. If that's the case, he'd likely pitch during a three-game home set against Boston that begins Monday.