Gaskell, who is at home at lock and in the back row, has been in superb form again this season and continues to play a key role for Sale Sharks. The 23-year-old has excellent athletic ability and has represented England at U18 and U20 level, while he has also previously captained England Saxons.
Miller has also been a standout performer for Sale Sharks this season, picking up the man of the match award in his last display for the Club in their win over Biarritz in the Amlin Challenge Cup. The 24-year-old fullback has represented England at U16, U18 and U20 levels, and most recently played for England Saxons in their games against Irish Wolfhounds and Scotland A.
Director of Rugby Dai Young said: “We are delighted to bring James and Rob to Wasps. They are both young, ambitious players and, from talking to them, I am sure that they will fit in well with what we are trying to do here at Wasps. Both players have a great amount of potential and I look forward to them both continuing to develop and improve in black and gold.”