Players with unsigned tenders can't be traded until signed. I dealt with this particular aspect of Bell's situation while an agent. One of the players I helped represent was cornerback Jimmy Hitchcock. The
Patriots informed us during the 1998
NFL Draft, after they used a first-round pick to select
Tebucky Jones, a safety who would be moved to cornerback, that a trade with the
Ravens had been worked out for Hitchcock. Since Hitchcock didn't want to be dealt to a team that drafted a cornerback in the first round, we advised him to refuse to sign his restricted free-agent tender. His refusal killed the trade. Hitchcock subsequently signed his tender for a trade to the
Vikings, who hadn't used a high draft choice on a cornerback. Essentially, Bell has a de facto no-trade clause or veto power of a trade.
By CBA rule, franchise players who don't sign long term by the mid-July deadline are prohibited from signing a multi-year contract until after the 2018 regular season, which ends on Dec. 30. This prohibition on signing a long-term deal also applies to any team acquiring Bell in a trade.