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Nam Y. Huh/Associated Press

The San Francisco 49ers still need to replace retired inside linebacker Patrick Willis.

If they wish to replace him in the first round of the upcoming draft, they can take Jaylon Smith of Notre Dame or Myles Jack of UCLA. Either player would be a terrific pick.

Jack (listed at 6'1", 245 lbs) played outside linebacker at UCLA but would play inside linebacker in the 49ers’ 3-4 defense. He’s about the same size as NaVorro Bowman (6'0", 242 lbs).

Jaylon Smith (listed at 6'3", 240 lbs) is taller than Jack, which works in Smith’s favor. The Niners need a tall linebacker to cover division rival Jimmy Graham, so Smith is a good fit. He should be No. 6 on the 49ers draft board.

In ascending order, here are the top players San Francisco should target in Round 1 of the upcoming draft.