First of all ... rumor.
Second, if teams really are making offers, the offers are most likely draft picks, which may not be particularly useful to the Pats at this point. The Pats 2017 roster seems still to be in the "building" phase and, IMHO, neither the offensive or defensive playbooks are close to being "fully-installed." So, a player would seem far more valuable than a future pick.
OTOH, if a team expressed a desire to trade for Lewis, AND that team had a player who could be useful to the Pats right now, they might consider it.
However, I don't think that the Pats are done with Lewis yet. I think that Gillislee and Burkhead saw a lot more snaps in the opener because they needed them. So, Lewis' apparent "underusage" Thursday might be as much related to that as to protecting him.
We'll need to wait and see what happens in NOLA.