Six weeks ago, Green Bay Packers coach Mike McCarthy indicated he had a plan for his offensive line.

“We need some improvement from the left side of our line,” McCarthy said at the NFL annual meetings in late March. “That’s, if you’re breaking down the line as a whole, our left side and the center position, we need improvement there.”

It’s now known how McCarthy will implement that plan: by shuffling around some players.

Bryan Bulaga and Josh Sitton have been the Packers’ two best offensive linemen over the past three years. So the thinking in moving them to the left side of the line was relatively simple.

Packers coach Mike McCarthy could not be reached by the Press-Gazette on Friday but explained the moves during an appearance in Madison.

“It’s really a combination of (many) things,” McCarthy said, according to the Wisconsin State Journal. “No. 1, it starts with (the fact) we have a right-handed quarterback. His back side is obviously the left side. Both Josh and Bryan are our two most accomplished offensive linemen. So that’s really the starting point. But there’s things that we’re going to do as we move into the season, particularly football scheme-wise, that we feel this is the best decision for us.”

A team source confirmed Bulaga moved to left tackle and Sitton to left guard when Phase II of the offseason program began this week. In Phase II, the players work on the field for the first time after spending Phase I on strength and conditioning. The third and final phase of the offseason program begins May 20 and includes organized team activity practices and the mandatory minicamp in June.

The move also is sign the Packers feel Bulaga has fully recovered from the season-ending hip injury he sustained in Week 9 against the Arizona Cardinals.