A source told ESPN that five teams in addition to Pittsburgh reached out to Chicago, and the majority of those teams had envisioned the former first-round pick in a backup role. Additionally, the Steelers had been in talks with the Bears throughout the week of free agency and reached out again after sending Kenny Pickett to the Philadelphia Eagles on Friday. The Bears had an additional offer with stronger draft capital from a team with an established starter, per a source, but chose to send Fields to Pittsburgh with the hope of putting the 25-year-old in a position to continue his development -- first as a backup to Wilson and eventually as a starter.
In Indianapolis, Bears GM Ryan Poles said he wanted to "do right" by Fields, which included not keeping him on a team with a rookie and finding a spot where he could continue developing. In Pittsburgh, Fields will have that chance.
https://www.espn.com/nfl/story/_/id/39747405/nfl-justin-fields-steelers-bears-trade-russell-wilson