Cracking a NFL roster after going undrafted is a difficult feat to achieve, as players are truly working their way up from the bottom of the depth chart.
That is not to say it is impossible, however. The Las Vegas Raiders can attest to the value that keeping undrafted players around and developing them can provide. Just last season, three major contributors in running back Sincere McCormick, linebacker Amari Gainer and safety Isaiah Pola-Mao received the first regular season games of their careers, despite never hearing their names called on draft day.
With a strong training camp and a little luck, these three could make a splash during their rookie years.