when I have a client with shoulder issues, I am particularly careful with the bench press. I usually include exercises for the rotator cuff; your client may have some of those already from a physical therapist.
Because I coach my clients that they should not bring the elbows below shoulder level, I often start them on the floor where this is not even a possibility. Having the upper arms in a straight line from elbow to elbow is usually the bench press position but, with shoulder issues, the client may find a pain-free range of motion when the elbows are dropped a little closer to the waist.
It goes without saying to start with low weight and a moderated number of reps. Check with the client the next day to find out about any discomfort after the exercise session.
Good luck with the client.