CC Sabathia had arthroscopic surgery on his right knee Tuesday, a procedure that general manager Brian Cashman previously described last week as a routine “cleanup,” and is expected to be ready for spring training.

“It’s not something that’s of concern or considered serious,” Cashman said last Wednesday during his end-of-season news conference at the Stadium.

The 36-year-old Sabathia, after three straight rough seasons, caused at least in part by a bothersome right knee, went 9-12 this year but with a 3.91 ERA. It was the lefthander’s lowest ERA since 2012.

Additionally, Sabathia, who has one year left on his contract, finished the season on a roll, going 2-2 with a 2.37 ERA in his last eight starts.

The 30 starts he made this season were his most since making 32 starts in 2013, a year he went 14-13 but with a 4.78 ERA.

A new lightweight brace helped Sabathia post a 2.17 ERA over his last five outings of 2015 and the veteran, though there were some ups and downs, carried much of that momentum into 2016.

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After a spring training in which Sabathia had to fight hard to hold off Ivan Nova for the fifth-starter job, he ended up throwing 179 2/3 innings, second on the club behind Masahiro Tanaka’s 199 2/3.

“It was good,” Sabathia said at the end of the season. “I was able to make it through healthy, make 30 starts. Just looking to do the same thing next year and just get better.”