Lamb was overshadowed by Jake Ferguson and Michael Gallup in the offense.
Lamb has now seen seven or fewer targets in three of four games on the season.
He still managed to salvage his fantasy performance with a 20-yard touchdown catch late in the first quarter -- his first trip to the end zone this season.
He'll turn his attention to another tough defensive matchup in Week 5 as the Cowboys are set to square off against the 49ers.