The Patriots continue to add players to the mix for the start of rookie camp on Friday. We’ve already run down a handful of them here, but over the last 24 hours, we’ve been alerted to four more players who are in the mix:

Terrence Johnson, a cornerback out of California University of Pennsylvania, was signed as an undrafted free agent, according to the school. Johnson, six feet tall and 190 pounds finished his college career as one of the most decorated defensive players in the history of the school, ending with 178 tackles (133 solo) and 16 interceptions while starting at cornerback all four seasons. Johnson, who saw time on special teams as well, was selected an American Football Coaches Association (AFCA) and Associated Press All-American last season and was a two-time Daktronics All-American during his career.

According to his web site, Nyan Boateng, a 23-year-old wide receiver out of Cal, was also signed as an rookie free agent by the Patriots. The 6-foot-2, 211-pounder had 42 receptions, 630 yards receiving and seven touchdown receptions in 24 games and five starts with Cal, averaging 15.0 yards per catch and 26.2 yards receiving per contest. He made his debut with the Golden Bears in 2008 after transferring from (guess where?) Florida in the spring of 2007.

Boateng is an amazing story: He was born in Ghana and moved to the United States when he was six years old. Growing up in New York City, he played high school ball with Sebastian Telfair. And he speaks three languages — English, French and Twi (spoken in Ghana) — and has a cousin Derek who competed in the World Cup for Ghana. According to the Boston Herald, he also reportedly failed a drug test at the combine, so there’s that. Here’s some video of Boateng from 2008:

Northwestern’s Andrew Brewer has also earned a camp tryout with the Patriots, according to the Chicago Tribune. The 6-foot-3, 215-pounder began his college career as a quarterback with the Wildcats, but made the move to wide receiver and flourished the last couple of years, closing his career with an average of 14.7 yards per catch. This past season, the wide receiver led Northwestern in receiving yards (925) and touchdowns (9), and set a single-seson school record with a 16.2 yards per reception average. Here’s video on Brewer:

In addition, multiple reports indicate that Villanova Ross Ventrone — brother of former Patriots’ special teamer Ray Ventrone, who was in New England from 2006 through 2008 and is now in Cleveland — has gotten an invite. Ventrone is a 5-foot-8, 190-pound defensive back who had 42 tackles and four interceptions over the course of his college career with the Wildcats.