The Seahawks are finalizing a deal to send Nick Vannett to the Steelers, a league source, told ESPN's Adam Schefter.
The Seahawks will receive a fifth round in 2020 in the deal, the source said.  Stewards, starting at tight end, Vance MacDonald injured his shoulder early in Sunday's loss to San Francisco and his shoulder was slingshot on Tuesday, but as to how much time he could miss, a source told Schefter: "No. long. " His status for Week 4 on Monday night against the Bengals was not announced by the team.
Vannett will join the Pittsburgh band, which includes Xavier Grimble and Zack Gentry. The team also signed Alizé Mack to his practice squad on Tuesday.
Vannett was selected for the third round in 2016 outside of Ohio and is in the final year of his rookie contract. He caught 48 passes for 463 yards and four touchdowns in 42 regular-season games. His best season was 2018 with 29 catches for 269 yards and three touchdowns.
Vanet is the second end of the Seahawks this season behind Will Disley, who is now the only true tight end on their 53-man roster. However, George Font's backup decision is actually a tight end. Seattle also has Jacob Hollister in his squad. Veteran Ed Dixon is eligible to return an early reserve in Week 9.
The addition of the Pittsburgh Fifth Round gives the Seahawks 10 peaks in the 2020 draft, including the four compensation selections they are expected to receive.
Brady Henderson of ESPN contributed to this report.