When the Vikings were 4-3-1 at the midpoint of the season, quarterback Kirk Cousins declined to say he was disappointed. That changed to a degree on Thursday.

Speaking to reporters at TCO Performance Center, Cousins acknowledged the Vikings (6-5-1) have not lived up at times to their potential.

“I do think that we can point to some times throughout the year where we’ve underachieved, not because we weren’t giving effort or preparation, but we just haven’t been able to sustain the level of potential in this locker room, play in and play out,” he said.

After advancing to the NFC Championship Game last season, and signing Cousins as a free agent in the spring, the Vikings were considered a strong favorite to contend for their first Super Bowl appearance since January 1977.

But the Vikings (6-5-1) have lost three of their past five games, the latest a 24-10 defeat last Sunday at New England. With four regular-season games remaining, they hold the No. 6 playoff spot in the NFC. On Monday night, they play at Seattle (7-5), which is No. 5.