Sullivan started 10 games and played in all 17 with the Vikings last season, finishing with no picks and seven passes defensed. He'll be depth for a Steelers team that saw their depth tested often last season. Sullivan only has 62 special teams snaps over his past two seasons so he's not exactly someone who is guaranteed to make the Pittsburgh roster. 

Chris Tomasson of the St. Paul Pioneer Press said that the "belief" is Sullivan will spend most of his time in the slot. However, Sullivan believes he's capable of lining up anywhere to contribute. Per PFF.com, Sullivan has appeared on 2,132 defensive snaps for his career, with 1,432 of them coming from the slot. In 2019, Sullivan saw some work at free safety in addition to slot corner, but he'll likely step back into his familiar slot role in 2022.

Sullivan, 25, reunites with former Packers DC Mike Pettine in Minnesota. Sullivan appeared in all 49 games for the Packers over the last three seasons, making 20 starts in that span. He gives the Vikings a capable body in the secondary, but Minnesota has more work to do on the back end at cornerback.

Sullivan had a highly-successful small sample size with the Packers and current Vikings DC Mike Pettine in 2019. He hasn't done quite as well over the past two years, allowing 8.9 yards per target in 2021 per Sports Info Solutions. The Vikings currently have Cam Dantzler, Kris Boyd, Harrison Hand, and Parry Nickerson under contract at corner, with Patrick Peterson and Mackensie Alexander still free agents.