It's the first career recall for Austin, a seventh-round pick by the Sabres in 2012. He has nine points (2+7) in 61 games for Rochester this season, his third as a pro.
Nelson, meanwhile, began this season in Buffalo after impressing in his short stint with the team to end last season. He's averaged 11:00 of ice time in nine NHL games this season, with his most recent appearance having come in an overtime win at Montreal on Jan. 21.
"I think his best games were last year playing for us," Sabres coach Dan Bylsma said prior to the game. "We see a good skating, smooth guy, a head-up, good first-pass guy who has a real good offensive hockey instinct and that's what you saw from him in training camp as well."
In 45 AHL games this season, Nelson has four goals and nine assists for 13 points.
Of course, injuries on the blue line might also mean an increased workload for Rasmus Ristolainen, as Chris Ryndak reported from practice at HarborCenter on Sunday. He wrote:
The burden of playing heavy minutes has been placed Ristolainen all season and the team will likely lean on him even more because of the recent crop of injuries.
He's topped the 30-minute plateau twice in the past four games, skating 30:02 on Friday. He's been at or above 30 minutes eight times this season, with his highest total coming on Jan. 20 against Detroit, when he played 35:24.
At 27:01, he's fourth in the NHL in average time on ice per game, behind only Dustin Byfuglien (27:24), Drew Doughty (27:16) and Ryan Suter (27:04).
You can read the full report, with comments from Bylsma and Ristolainen, here.
Also, check out Brian Duff's report from practice in the video below.