If you mean 3 DCs in defence then you can play a 4-5-1 V formation
-----ST-----
AML(⇧)-----AMR(⇧)
---MC--MC---
-----DMC-----
DL(⇧)-DC-DC-DR(⇧)
The ⇧ means put attacking red arrow on that player
Use this orders as well:
Mentality: Normal
Passing style: Mixed
Focus passing: Down both flanks
Pressing: Own half
Force Counter attack: Yes
Offside trap: No
Marking: Zonal marking
I used this personally against 3-1-4-2 and won 5-0 and 6-2
Thanks to Adel Gamal for the tactics