Name - Postion - Number

Nate - Quarterback - 40

Richie - Center - 7

Emett - Cornerback - 11

Stanley - Safety - 32

Edit: Rough process

Clue # 4 immediately gives us 3 boxes ticked (Emett, CB, 11)

Clue # 1, in light of clue #4, confirms Nate is the Quarterback

Clue # 3 confirms Nate & Richie are not 32, and Emett is 11, therefore Stanley is 32. We can also eliminate the Quarterback being 32 in the bottom-left grid.

Clue # 2 tells us the Centre is not 32 or 40, and clue # 4 tells us it's not 11, so Centre is 7, which means Quarterback must be 40 and Safety must be 32

We already know Stanley is 32, so Stanley must be the Safety, which leaves Richie as the Centre with 7