Colin Kaepernick impresses during workout with Las Vegas Raiders: reports

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Colin Kaepernick appears to be inching closer to a potential NFL return. 

Kaepernick impressed the Las Vegas Raiders during a workout with the team on Wednesday, according to the NFL Network. 

The outlet reported that the "door is open" for the free-agent quarterback, who hasn't played in an NFL game in more than five years. 

Colin Kaepernick #7 of the San Francisco 49ers makes a pass on the run during a preseason game against the San Diego Chargers at Qualcomm Stadium on September 1, 2016, in San Diego, California.  (Harry How/Getty Images)

The Raiders were specifically impressed with Kaepernick's arm strength and conditioning, and the team considered the workout to be largely a "positive" sign, ESPN reported. 

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On Thursday, Raiders head coach Josh McDaniels declined to say whether the team would be signing the quarterback. The coach noted during a press conference he wouldn't be taking questions about players that currently aren't on the team. 

"We've brought in tons of people for workouts," McDaniels told reporters. "We said it from day one that we would look at every opportunity, and he's not the first player that we looked at and not the last one."

Colin Kaepernick looks to make a pass during a private NFL workout held at Charles R Drew high school on November 16, 2019, in Riverdale, Georgia. Due to disagreements between Kaepernick and the NFL the location of the workout was abruptly changed.   (Photo by Carmen Mandato/Getty Images)

"So there's gonna be a lot of people that are gonna come in and out of this building and have an opportunity to make an impression," the coach added. "The