Look, I don't know the guy from Adam, his feelings included, but if I were his GP, I would strongly advise he stay away from football entirely. But if he insists on playing again, he should do so in an environment as stress-free as possible. Brentford would be the logical choice in that scenario as the pressure/expectations on him will be minimal compared to United - where the fans and media are far less forgiving of poor performances.
I'm not saying that is the case with Eriksen, only that it's worthy of consideration for a guy prone to heart failure.