Malcolm Brogdon was brought to training camp by the Knicks with the thinking that the veteran could become the primary backup to All-Star point guard Jalen Brunson.

Now that Brogdon has abruptly retired less than one week before the start of the regular season, however, first-year coach Mike Brown will have to turn to in-house options such as combo guard Miles McBride or second-year player Tyler Kolek as Brunson’s understudy barring a trade or another free agent signing.

“We’re in good hands, great hands,” Brunson said after practice Thursday in Tarrytown. “[Kolek] has been getting better every day. Deuce has been getting better every day.

“Those guys, they come in and they work on their game nonstop. When you see that, you have the utmost confidence that when their number is called t

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