Guards Terry Poole and Mark Glowinski and center Kristjan Sokoli — Seattle’s three draft picks — looked sharp.

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RENTON — Rookie minicamps — three no-pads practices in the span of about 48 hours — are designed mostly for quick, first impressions.

And after Seattle’s ended Sunday afternoon, offensive line coach Tom Cable was left with this: “One thing I’m really excited about, I think this will be the most competitive camp for the offensive line from here out looking forward to training camp. That’s good. We’ll get the best out of some people and that will be really cool.’’

One obvious reason to think the offensive-line competition will be especially heated is because the Seahawks will have to establish new starters at center and left guard to replace the departed Max Unger and James Carpenter.

Another is the addition of three draft picks — guards Terry Poole and Mark Glowinski and center Kristjan Sokoli — whose performance in the minicamp seemed to only enhance the team’s initial excitement about their potential.

“This was a very exciting camp,’’ coach Pete Carroll said after it ended Sunday. “I probably can’t stop focusing on the O-line because of the three guys that we hit there.’’

Poole, a fourth-round pick who played tackle at San Diego State, spent the camp working at left guard. Glowinski, a fourth-round pick who played right guard his final season at West Virginia after playing tackle earlier, played right guard throughout the camp, but could also be tried at tackle down the road.

Each could become factors pretty quickly. Sokoli may need longer to get into the fray. A sixth-round pick out of Buffalo, he played defensive tackle in college but is being switched to center by the Seahawks.

Carroll said Sokoli’s speed has convinced the Seahawks he can make the move, while cautioning patience about how quickly it will happen.

“He’s our fastest lineman,’’ Carroll said. “So we thought ‘if it’s going to be a big transition, let’s go for it all and stick him right there and see if he can pick up on it.’

“It’s going to take him awhile, no question. But he showed the things that we needed to see as far as his ability to get out of his stance and get going and get up to the second level. He did that a number of times. He didn’t know who he was blocking half the time, but he was moving quickly and showed that he’s got a shot at it.’’

For now, the Seahawks say Sokoli will be used solely as a center to allow him to get as many snaps as he can at that spot. The learning curve was evident at times throughout the camp, especially on Saturday when there were a few noticeable missed exchanges with quarterbacks.

“Understandable,’’ Carroll said. “But all in all, very good.’’

Cable also left excited about two other players — undrafted free agent Jesse Davis of Idaho, who played left tackle; and Kona Schwenke, a tryout player who spent the camp at guard.

Schwenke has a particularly intriguing background, having been a defensive lineman at Notre Dame and then getting shots on the D-line with four NFL teams in the past year — Chiefs, Jets, Patriots and Raiders — without sticking. He was cut by the Raiders earlier this week before Seattle brought him in and decided to put him on offense.

“He’s kind of showed up, too,’’ Cable said of Schwenke, who would have to be signed and added to the 90-man roster to remain with the team.

Seattle appears to have three sure things on the line in left tackle Russell Okung, right guard J.R . Sweezy and right tackle Justin Britt. If the team played today, Patrick Lewis would likely be the starting center and Alvin Bailey the starting left guard.

Cable confirmed afterward that Bailey has dropped about 30 pounds in the off-season, back down to his listed 320 after having gained some weight following his rookie season in 2013.

“I think he’s learned,’’ Cable said. “That’s maturity. The mission was for him to come back at the 320 mark, where he can be at his best, because he got too big.’’

Williams makes impression

Carroll said former UW and Skyline receiver Kasen Williams “looked very good’’ and that the team will try to sign him to a contract — he participated on a tryout basis.

“We’ve known him for a long time through the recruiting process (when Carroll was at USC) and our expectations are that he is a really accomplished receiver,’’ Carroll said. “Great athlete getting off the ground and all and he showed all of that. He looked like he fit. So we’ll try to get him back.’’

Carroll said he liked what he saw of Frank Clark, the team’s first pick taken in the second round. Clark played defensive end, rush end (or what the team calls its LEO position) and defensive tackle in passing downs.

“There’s not much limitation to what we can do with him.’’ Carroll said. “He has the ability and the range and seemed to pick things up very, very easily. He’s going to be a very versatile player for us, I think.”

Notes

• Carroll was also left impressed by third-round pick Tyler Lockett, a receiver and return specialist.“Tyler looked so comfortable,” Carroll said Sunday. “He’s an adept football player, a very natural player.”

• Carroll said again the team still hopes to re-sign Tarvaris Jackson as backup quarterback. But he said he liked what he saw of free agent R.J. Archer during the minicamp and that he could be a legitimate contender for the backup spot.

• Receivers coach Kippy Brown is in the process of retiring and is expected to be replaced by Dave Canales, who has been the team’s assistant quarterbacks and offensive quality control coach.