Leeds Rhinos have brought in Robert Lui and Shaun Lunt, with Tui Lolohea and Matt Parcell leaving Headingley.
Leeds Rhinos continue to struggle near the bottom of Super League and were well beaten on Friday night by leaders St Helens.
Leeds Rhinos will allow Kallum Watkins to leave at the end of June after the centre signed a long-term deal with Gold Coast Titans.
Normal service was resumed for leaders St Helens, who took their frustration out on Huddersfield after a stunning loss to the Broncos.
Tuimoala Lolohea scored the only try of the game in testing conditions as Leeds Rhinos moved four points clear of London Broncos.
Kallum Watkins is looking forward to a new challenge either in the NRL or with another Super League club.
Seven tries from seven different players saw St Helens beat Castleford Tigers and restore their six-point lead at the top of Super League.
Leeds Rhinos' dismal Super League campaign continued as they were well beaten at home by Castleford Tigers on Thursday.
Leeds Rhinos have dismissed David Furner as head coach after just 14 Super League games in charge.
Warrington Wolves put the pressure on Super League leaders St Helens with a comfortable win at Castleford Tigers on Friday.