Weber, 22, joined the Chiefs’ practice squad Jan. 8 and then signed a futures contract.
The Cowboys made him a seventh-round choice in 2019, but he failed to make the roster out of training camp. He spent a few weeks on the Cowboys’ practice squad.
Mack, 23, signed a futures contract with the Chiefs in January after spending a few weeks on their practice squad last season.
The Saints made Mack a seventh-round choice last year. He failed to make the roster but signed on with the Steelers’ practice squad for a brief stint.