Seahawks coach Pete Carroll on Tuesday told reporters that Baldwin arrived at training camp with a sore knee.
"We're going give it a couple weeks here before we bring him back," said Carroll, per the News Tribune. "We just want to make sure we take care of him. ... It's a little bit of a problem."
Baldwin was named to the Pro Bowl as an injury replacement after he caught a team-leading 75 receptions for 991 yards and eight touchdowns in 2017.
It marked the third consecutive season with at least 75 catches for Baldwin, who set career highs with 94 receptions and 1,128 yards in 2016 while also earning Pro Bowl honors.
The 29-year-old Baldwin emerged as one of the league's top wideouts in 2014 when he had his first 1,000-yard season (1,069) on 78 receptions while establishing a career best with 14 touchdown catches.
An undrafted free agent out of Stanford, Baldwin has spent his first seven seasons with the Seahawks. He has 443 receptions and 44 touchdown catches while starting 77 of 110 games.
Baldwin has appeared in 12 postseason games with Seattle, hauling in 55 catches for 702 yards and six touchdowns.
With Baldwin sidelined, the top receivers for the Seahawks are offseason acquisition Brandon Marshall, Tyler Lockett and Jaron Brown.