The Giants continue to upgrade their offensive line with the signing of Mark Glowinski. Robert Scheer/IndyStar / USA TODAY NETWORK

In need of another offensive line overhaul, the Giants added a piece Monday night. They agreed to sign former Colts guard Mark Glowinski, Ian Rapoport of NFL.com tweets.

Part of a top-tier Colts O-line for the past four seasons, Glowinski agreed to join the Giants on a three-year deal worth $20M. The veteran inside blocker will receive $11.4M fully guaranteed, RapSheet adds.

Although Glowinski was far from the best O-linemen the Colts deployed in recent years, he helped Indianapolis’ cause and started in each of his four seasons with the team. The Colts gave the ex-Seahawks fourth-round draftee a three-year, $16.2M extension in January 2019, making this a slight pay bump for the seven-year veteran.

The Giants played shorthanded on their interior line throughout last season, seeing Nick Gates and Shane Lemieux suffer season-ending injuries early on. The team acquired Billy Price and Ben Bredeson as stopgaps, adding fellow ex-Raven Matt Skura as well. Both ex-Baltimore cogs are under contract for 2022, but four-year starter Will Hernandez is a free agent.

New York may well be starting over up front, with the exception of left tackle Andrew Thomas. Glowinski will certainly take over as one of the team’s starting guards, having made 74 career starts. But the team has more work to do up front going forward. The draft will be a key resource here, with the Giants the rare team to hold two top-10 picks in a draft.

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