The Oakland Raiders enter the first round of the NFL draft Thursday with seven selections for the three-day festivities.

Chances are by the time general manager Reggie McKenzie and his staff begin calling undrafted free agents Saturday, they'll end up with more than seven drafted players.

"When you've got 31 other teams, you have no idea who they want at a certain time," McKenzie said at a pre-draft news conference. "That's what makes it fun - the uncertainty. I can be hard-headed and stubborn and say, 'I'm not moving.' But that's not my style. My phone line stays open on draft day."

The pre-draft rumor mill has linked the Raiders to Buffalo linebacker Khalil Mack, Clemson wide receiver Sammy Watkins and even Texas A&M quarterback Johnny Manziel.

It's even money those names will be used as currency by the Raiders to add to their draft cache with teams wanting to trade up and get them.

Given the way McKenzie operated last season and to a lesser extent in 2012, he'll be open to trading back and getting additional picks. The Raiders enter the draft without picks in the fifth and sixth rounds as the result of trades for quarterbacks Matt Flynn (from Seattle) and Matt Schaub (from Houston).

One way to recoup those selections is to trade their No.5 pick for a lower pick in the first round and receive additional picks in the process. A year ago, when Miami wanted Oregon linebacker Dion Jordan, McKenzie dealt the No.3 selection in exchange for the Dolphins' pick at No.12 and their second-round selection at No.43.

The Raiders turned that into Houston cornerback DJ Hayden - whom McKenzie said the Raiders would have taken at No.3 - and Florida State tackle Menelik Watson, neither of whom made a significant impact as rookies because of injuries.