The Las Vegas Raiders have agreed to a three-year contract extension with left tackle Kolton Miller that could be worth up to $68.7 million, according to a source.

The deal puts Miller among the top five highest-paid offensive tackles in terms of average annual value.

The $68.7 million includes the $2.316 million salary from the last year of Miller's rookie deal, a fifth-year option worth $10.88 million, and the three new years on the deal, which can be worth $18.505 million per year if he hits certain incentives. It carries $42.6 million guaranteed at signing.