The Vikings “Top 30” event is approaching on Wednesday and Thursday and it appears there will be plenty of linebackers at Winter Park.

Among those previously reported include UCLA linebacker Anthony Barr and Louisville linebacker Preston Brown. Now Buffalo linebacker Khalil Mack is scheduled to be in attendance, according to Boise State defensive end/linebacker Demarcus Lawrence and North Dakota State offensive tackle Billy Turner will also attend, according to two NFL sources.

It’s unlikely that Mack would be available with the Vikings’ eighth overall pick, but the outside linebacker is a prospect that could start opposite to Chad Greenway and immediately fill a need. Listed at 6-3 and 251 pounds at the NFL Combine, Mack was a second-team All-American last year and a first-team All-MAC selection with 100 tackles, 19 tackles for loss, 10.5 sacks, three interceptions and five forced fumbles.

Lawrence, listed at 6-3 and 251 pounds at the Combine, is the fifth best outside linebacker according to ESPN’s Todd McShay and the eighth best defensive end by ESPN’s Mel Kiper. Lawrence was a first-team All-Mountain West selection during his two seasons with Boise State (transferred from Butler Community College). Lawrence was also suspended three times in those two seasons for violating team rules.

“I think I've matured,” Lawrence said at the Combine. “Right now I feel that really I've grown up a lot on and off the field. It's really not a problem. I feel like I became a better man, not just for myself but for others.”

Turner is the first reported offensive lineman. The Shoreview, Minn. native started 56 of 57 career games at North Dakota State. The two-time AP FCS All-American measured at 6-5 and 315 pounds at the Combine and also participated at the Senior Bowl. His father, running back Maurice Turner, was drafted out of the 12th round by the Vikings in 1983.