Watson, 18, and Robson, 16, have both made impressive strides in the senior game and will join Fed Cup stalwarts Elena Baltacha and Anne Keothavong for the round of matches in Eilat, Israel, which will be played in the week beginning 31 January.
Captain Nigel Sears said: "This team has an exciting look about it. Two players who have reached top 50 and two junior grand slam champions."