In search of upgrades for their roster, the Yankees have acquired utility infielder Reid Brignac from Colorado for cash considerations. The Rockies designated Brignac for assignment earlier this week, after he posted a .669 on-base plus slugging percentage for them in 29 games this season. The Yankees see Brignac as a left-handed hitter who can platoon with right-handed batters Jayson Nix and David Adams on the left side of the infield. Manager Joe Girardi sees Brignac as a solid defender who will mostly play shortstop. “I envision him as a choice that Joe Girardi will look at every day to see if he wants to play him in any spot on the infield,” general manager Brian Cashman said before Saturday’s 7-2 victory over Toronto. Brignac will not join the team until Sunday. They will play without a backup infielder on Saturday. To make room on the roster, shortstop Alberto Gonzalez was designated for assignment.