The white water canoeing had taken care of Johnstone (punctured eardrum) and the mountain climbing in Wales had done for Whittaker (groin strain).
Center Andris Biedrins remained sidelined with a sprained left ankle, and reserve forward Anthony Randolph left the game with 8:44 left in the second quarter because of a groin strain.
Mussina has had elbow problems in the past two years, but this year has been healthy, except for recurring groin strains.
