On March 13, 2013, Dorsey, who was miscast as a DE in a 3-4 system with the Chiefs, signed with the 49ers, and is slated to play NT after the 49ers lost both Isaac Sopoaga and Ricky Jean Francois, who were the #1 and #2 NTs last season (RJF also played DE) The 49ers will likely give Dorsey plenty of penetrating opportunities, using him like the Cowboys used NT Jay Ratliff, as opposed to using him as a two-gap plugger like the Chiefs, according to 49ers insider Matt Maiocco (who added that Dorsey signed two-year, $6 million deal and also will receive a $2.3 million signing bonus) "We are very pleased to add Glenn to our team," 49ers general manager Trent Baalke said. "Glenn brings great versatility to our defensive front, and we look forward to his contributions on the field and in the community." "I really look forward to the opportunity," Dorsey said. "I got the call from my agent and I hopped on a plane first thing." 49ers defensive line coach Jim Tomsula picked him up at the airport. "He picked me up from the airport last night and he was talking 100 miles per hour. And I was ready...He took me to the facility last night and we talked about a lot of stuff. And he knows a lot. I'm excited to get the opportunity to work with him." Dorsey said he met with Tomsula, head coach Jim Harbaugh and bumped into linemate Justin Smith, who is recovering from triceps surgery. "It's a positive atmosphere," Dorsey said. "Everybody is working hard and talking to each other. And you can feel it when you walk into the building. It's like a big family. Everybody is high fiving each other, talking to each other -- it's a different environment than what I'm used to. I'm excited about it and I'm excited to get going."