STAY COOL TMZSports.com
It's been about a month since Puka Nacua's brother, Samson Nacua, slapped a fan following a UFL game ... and now he's telling TMZ Sports the advice he gave his older bro after the ugly incident.
We caught up with the L.A. Rams star at LAX ... where we asked him about the counsel he provided 27-year-old Samson after the late April incident.
"Try to be able to compose yourself," Puka said.