Knowles caught his only target for a one-yard touchdown and returned one kickoff for 24 yards in Saturday's 27-12 preseason win over the Browns.
The undrafted receiver out of Kansas State missed all of last season with an undisclosed injury, and he also began training camp dealing with an injury that kept him out of the Vikings' preseason opener. Knowles was in the lineup Saturday, however, and looked pretty healthy, leaping high to snag a one-yard corner fade from Jaren Hall at the back of the end zone on Minnesota's first possession of the second half. Knowles' ability to return kickoffs -- he had 1,254 return yards over his final two years at Kansas State -- could give him an edge on winning at least a spot on the practice squad given the NFL's changes to the kickoff rules this season.