Captain Luke Braid, Brendon O'Connor, Frank Halai and Bryn Hall have re-signed with the Blues.
Loose forwards Braid and O'Connor, and wing Halai, have signed one-year deals, while halfback Hall has re-signed until the end of 2016.
"It's really good to re-sign Braidy and Brendon together, they're both outstanding young men and very good players," Blues coach John Kirwan said.
"We need to be able to play Brendon more so he gets more game time. He's a player with a big future in the Blues and with Braidy coming off his shoulder surgeries, we don't know if he'll be ready in time for the start of the season so it's a really important time for Brendon to get in there and really put pressure on us and Braidy."
