"As a player, when a guy's unhappy, he's unhappy. It looked like he was pretty much unhappy," Cook said, per Chris Tomasson of the St. Paul Pioneer Press. "[I] just told him, 'That's my brother for life and I'm still here with you.' And he was the same. Vice versa."
The Vikings traded Diggs and a seventh-round pick to the Buffalo Bills in exchange for first-, fifth- and sixth-round picks in 2020 and a fourth-rounder in 2021. The deal came after Diggs expressed his frustration with the Vikings on several occasions during and after the 2019 season.
"That one hurt," Cook said. "It hurt. That's my brother. You know how close me and Diggsie were. To see him leave, it hurts because you spend so much time with a guy. … It hurt a lot of guys in the locker, room but it's part of the business. We've got to accept that Diggs wanted to be happy and be happy for him as a player."
Diggs saw his role in the Vikings offense drastically change in 2019, going from an underneath threat who caught a ton of intermediate balls to being their most reliable downfield target. He responded well, making 63 receptions for a career-high 1,130 yards and six touchdowns. In Week 6, Diggs recorded a career-high 167 yards and three touchdowns in a win over the Philadelphia Eagles.
Cook's own time in Minnesota could be ending before anyone expects. The fourth-year back is heading into the final year of his rookie contract, and it does not appear he and the Vikings have made any progress on a long-term deal. It's unlikely that the Vikings trade him, but a reunion in Buffalo a year from now might not be out of the question if Devin Singletary struggles to take over No. 1 running back reins in 2020.