Bradford is officially listed as questionable for Week 2, but appears to be on track to start.
ESPN first reported that Bradford had an MRI on his left knee this week.
The veteran quarterback, entering the final season of his contract, earned NFC Offensive Player of the Week honors after completing 27 of 32 passes for 346 yards with three touchdowns and a career-high 143.0 passer rating. Adam Schefter added that the "Vikings have guarded optimism but concern" about Bradford's left knee injury, which did require an MRI this week.
Vikings quarterback Sam Bradford boarded the team's charter flight to Pittsburgh, according to Andrew Krammer of the Minneapolis Star Tribune. While the common belief is that Bradford will still play against the Pittsburgh Steelers on Sunday, his knee injury still reportedly required an MRI earlier this week.
His left knee is the same knee in which Bradford suffered a torn ACL in both 2013 and 2014.
Sloter was promoted from the Vikings practice squad. All that can really be said at this point is stay tuned, because this year's rollercoaster in Minnesota is just getting started.
Sloter, an undrafted rookie from Northern Colorado, was signed September 4 to the practice squad after being waived two days earlier by Denver. They also wouldn't need to worry about Keenum starting any games, after he made nine starts for the woeful Los Angeles Rams last season. Undrafted out of Northern Colorado, Sloter threw for 413 yards and three touchdowns for the Broncos this preseason.