Vitor Faverani is learning quickly he’s a rookie. There will be moments like last night’s first quarter, when he heads to the bench with two quick fouls in his first three minutes. “They called two fouls. It’s the ref’s job,” said the 26-year-old Brazilian. “They call the fouls and I go to the bench. Nothing more. I’m a rookie. They call fouls. No problem.” On some nights Faverani would return from that black hole. But coach Brad Stevens had faith in his backup center down the stretch of the Celtics’ 90-86 win over the Knicks. After the reserves started a 20-5 fourth-quarter run, Faverani was the only reserve who stayed on the floor once Stevens made his final substitutions. Faverani rewarded the decision with two big shots — a 3-pointer and layup after connecting with Jordan Crawford on a pick-and-roll. He also forced a pair of Carmelo Anthony misses after switches left him guarding the Knicks star. Asked about Anthony, Faverani spoke for his teammates. “Yeah, they have Carmelo Anthony, and (Amar’e) Stoudemire and Kenyon Martin, and we have Jeff Green, Avery Bradley, so we can play the same,” said Faverani. “We don’t care about Carmelo or Stoudemire. We have very good players here.” Still, that’s Anthony he was talking about. “Yeah, I know,” Faverani said when Anthony’s superior quickness was mentioned. “That’s Carmelo Anthony, a good player. I tried to do my best and pray he missed the shot.” Olynyk returns After playing for the first time in three weeks, courtesy of a right ankle sprain, Kelly Olynyk’s first response was to lament his mistakes, like three turnovers in 14 minutes. He also finished with four points and four rebounds. Moving on, the rookie forward’s greatest challenge may be working back into game shape. “It might be a factor and you gauge that as he’s going along,” said Stevens. “Adrenaline plays a huge role, too. The first game back a lot of guys play really, really well. You never can tell with those things.” . . . Kris Humphries, who is expected to be ready Monday against the Timberwolves, sat out his second straight game last night with a bruised right knee. Stevens has developed a strong admiration for Humphries.