* Striker not fully recovered from knee surgery * Experienced defender Perea also misses cut (Adds quotes) BUENOS AIRES, June 2 (Reuters) - Colombia striker Radamel Falcao has failed to recover from knee surgery and was left out of their World Cup squad on Monday, coach Jose Pekerman announced. The 28-year-old ruptured the anterior cruciate ligament in his left knee while playing for Monaco in a French Cup match in January. Falcao, nicknamed Tiger, was a key element of the Colombia squad that finished second to Argentina in the South American qualifying group, scoring nine goals in 13 matches. More...