Don't think ya need it in league though. I haven't put out any last season and I got 25W and 1L. In cup or CL I add if it's against a good team.
I have only ever offered win bonus once, In a league game vs tough opponent in L12 and I lost 5-1 so I never offered it again. So without using win bonuses I won all these trophies including the 2 trebles from the last 2 seasons.