If Jose Quintana decides to leave baseball, he could become a maestro…

The Chicago White Sox left-hander appeared on “The Tonight Show Starring Jimmy Fallon,” teaching the late-night host a few Spanish phrases — some more useful than others — as a thank you for Fallon’s role in Quintana picking up English.

Quintana said he learned English by watching Fallon’s show, and now the 28-year-old Colombian pitcher regularly does interviews in English.

“I arrived in this country and watched your shows,” Quintana told Fallon. “So funny.”

Quintana taught Fallon how to introduce himself in Spanish, to tell people he hosts “The Tonight Show” and to ask others, “Can you pay for my thong?”

Fallon, a Boston Red Sox fan, attended the New York Yankees game against the White Sox on Tuesday night.

White Sox manager Rick Renteria watched “The Tonight Show” clip with his wife and called it “pretty funny.”

“He’s trying to get outside of the box, make sure that people see him as a well-rounded individual,” Renteria said of Quintana. “Hopefully, that’s an example for everyone else to get out there and relax and take advantage of some of the opportunities they’re going to be getting.

“I’ll tell you, he did a nice job with it.”