Volpatti, 27, has recorded one goal and 28 penalty minutes in 16 games with Vancouver this season. The native of Revelstoke, British Columbia, ranked second on Vancouver in penalty minutes this season and has collected three goals, one assist and 81 penalty minutes in 54 career NHL games with the Canucks.
The 6-foot, 215-pound forward tallied 13 points (three goals, 10 assists) and 91 penalty minutes in 61 career AHL games with Manitoba. He spent four seasons playing for Brown University in the NCAA and was named to the ECAC All-Academic team his first three seasons before being named team captain for his senior season.
Volpatti was originally signed as an undrafted free agent by Vancouver on March 22, 2010.
Grubauer, called up early Wednesday to play in place of an ill Michal Neuvirth, replaced Braden Holtby in the second period of Wednesday's 4-1 loss to the Philadelphia Flyers, stopping all 14 shots he faced.
The Capitals also sent forward Casey Wellman to Hershey.
McGrattan was assigned to the Flames' American Hockey League affiliate in Abbotsford.
Malkin skated for 30 minutes and reported no symptoms, according to the Penguins. There is no timetable for his return.
The New York Rangers will likely have defenseman Ryan McDonagh back in the lineup Thursday against the Tampa Bay Lightning, but Rick Nash and Michael Del Zotto are not sure bets to return from their injuries.
All three participated in an optional practice Wednesday in Greenburgh, N.Y., after missing Tuesday's 4-3 loss to the Winnipeg Jets. Forward Arron Asham, who has missed three games with back spasms, was not on the ice.
Tuesday's full practice proved to be a costly one for the St. Louis Blues.
Days after placing rookie wing Vladimir Tarasenko on injured reserve with a concussion and facial laceration sustained during Wednesday's game at the Colorado Avalanche, two more Blues forwards were hurt during practice.
Wednesday, the team announced that wing Andy McDonald has been placed on injured reserve with a left knee injury. McDonald is listed as week-to-week, and wing Alex Steen is day-to-day with an upper-body injury.
"One guy is day-to-day, so it's not a big deal," coach Ken Hitchcock said. "The other guy is week-to-week. It happens. We've got lots of guys coming in that are hungry, guys that have played in the NHL. So we shouldn't miss a beat."
Hitchock said he has not ruled out Steen for Thursday's game against the Chicago Blackhawks.
Oilers coach Ralph Krueger told the media Wednesday morning that Khabibulin tweaked his groin on the last shootout shot of a 3-2 victory over the Phoenix Coyotes on Feb. 23. He then aggravated the injury in overtime during a loss to the Chicago Blackhawks on Monday.
As a rookie with the Hershey Bears this season, the 21-year-old has posted a 6-4-1 record with a 2.10 goals-against average, a .928 save percentage and one shutout in 12 games.
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It was the look in his eyes. Hockey is the most important thing in his life. He wants to be a hockey player, and nothing's going to stop him from being a hockey player.