Surprised so many have gone with such low figures.The Q says all competitions. That likely means any figure under 30 constitutes less than 20 in the PL. I simply don't see him scoring that low unless injured for a considerable time. Same goes for a run in the CL, those teams probably won't have played against us before (not that I adhere to the theory that defenders can 'get used' to defending against him).
I'll go 38 (22 PL, 5 FAC, 3 LC, 8 CL).