Nick Bosa's outstanding rookie campaign with the San Francisco 49ers has DeForest Buckner believing there is no limit to what he can achieve in the NFL.

Defensive end Bosa was considered the best prospect in the 2019 NFL Draft and, after the Arizona Cardinals selected quarterback Kyler Murray first up, the San Francisco 49ers took him off the board with the second pick.

The son of former first-round pick John Bosa and brother of two-time Pro Bowler Joey Bosa, the youngest Bosa has already lived up to the family name with nine sacks and an interception across his debut campaign earning him a Pro Bowl nod too.

Bosa will almost certainly be named the NFL's Defensive Rookie of the Year on Saturday, 24 hours before he plays in Super Bowl LIV against the Kansas City Chiefs in Miami, and fellow defensive lineman Buckner feels his team-mate will only get better.

"I don't think there is a ceiling yet," he said. "I can't wait to see next year what he can do.

"He's been one hell of a talent and one hell of a hard worker.

"It's just been unbelievable to see that as a rookie, his technique, most of all, throughout the season has just got better.

"His win rate pass rushing-wise on a consistent basis has been unreal. I've never seen a rookie so polished coming out."

Prior to this season, Bosa, who, like his brother, went to Ohio State, had not played since September due to a groin injury sustained while playing for the Buckeyes.

That prevented him from impressing Buckner straight away, though the reason why the Niners drafted him so early on soon became clear.

"He was a little rusty obviously in OTAs, training camp, especially because he hasn't played football in a while," Buckner explained.

"But as we were getting closer and closer to the season starting you could see him really getting back into it.

"It was kind of like riding a bike again. Just to see him throughout the season skyrocket in his play has been unbelievable to see."