Despite being an undrafted free agent, Ferrell saw plenty of interest going into the 2016-17 season. He spent training camp with the Nets and despite not making the regular-season roster initially, Ferrell was eventually signed by Brooklyn in early November for backcourt depth. However, after just 10 games with the Nets, he was eventually let go, which cleared the way for him to sign multiple 10-day contracts with the Mavericks. After liking what they saw, Ferrell was eventually signed for the rest of the season and with injuries galore in the backcourt, he earned 29 starts in the 36 games he played in. Ferrell finished the season averaging 11.3 points, 2.8 rebounds, 4.3 assists and 1.1 steals across 29.1 minutes with the Mavericks. That established him as a legitimate NBA player and a potential starter with Deron Williams no longer in the picture. However, the Mavericks went ahead and selected Dennis Smith with the ninth overall pick in the 2017 NBA Draft, bringing in one of the elite point guards from the college ranks. That's absolutely devastating for Ferrell's value, as Smith should open the season as the team's starting point guard and will get all the minutes he can handle. That should push Ferrell to a bench role, where he'll fight for minutes with the likes of Seth Curry and J.J. Barea. With a significant drop in playing time and production expected, Ferrell likely won't be worth a look in anything but the deepest of leagues.