NFL Network's lead draft expert Mike Mayock is an invaluable source of information this time of year. Mayock hosted his annual pre-NFL Combine conference call on Monday and held court for well over an hour. Media members from around the country joined the call and asked questions about the teams and prospects from their respective regions.

During the conversation, Mayock touched on a few topics that are pertinent to the San Francisco 49ers. Specifically, the heralded draft guru shared how many players are worthy of the 49ers No. 2 overall pick. Mayock began by explaining that he doesn't have a single quarterback ranked in the Top-10 of this year's draft class.

According to Mayock, there are five players whose draft stock makes them deserving to be taken second overall. That would be Texas A&M defensive end Myles Garrett, Ohio State safety Malik Hooker, LSU safety Jamal Adams, Alabama linebacker Reuben Foster and Alabama defensive tackle Jonathan Allen.

"I think those five guys are all legit," Mayock said.

Here are some notes on each prospect.

Garrett: This year's top edge-rusher is also widely regarded as the top overall player in the 2017 NFL Draft. Garrett posted 31 career sacks in three seasons with the Aggies.

Hooker: One of the top two safeties in his class, Hooker grabbed seven interceptions in 2016, returning three for touchdowns.

Adams: The other clear-cut top safety in 2017. Adams posted 7.5 tackles for loss in 2016 with one sack and one interception.

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Foster**: A do-it-all linebacker that some draft analysts forecast to be starting next to NaVorro Bowman in 2017. Foster recorded 13 tackles for loss and five sacks in his final season with the Crimson Tide.

Allen: This year's top-ranked interior defensive lineman racked up 10.5 sacks and a whopping 16 tackles for loss last season at Alabama. Mayock raved about Allen several times throughout the call.

Mayock added that an argument can be made for two running backs to be taken in the Top-5.

"If you want to talk about whether or not running backs should go that high, you can have that conversation also with (LSU's) Leonard Fournette and (Florida State's) Dalvin Cook," Mayock said.

As for the consensus top wideouts this year – Clemson's Mike Williams and Western Michigan's Corey Davis – Mayock evaluated their potential value at No. 2 overall.

"I think it's a bit of a reach. I think their value starts around (pick) 10 or so," he said. "I wouldn't quite put them up with that other group."