Sharks forward Tomas Hertl expects to be out a month with an injury to his right knee, according to a Czech sports reporter who contacted the 20-year-old player's father. Roman Jedlicka with TV Nova Sport said that Jaroslav Hertl said his son messaged him with that prognosis immediately after San Jose's 4-1 loss Thursday night to the Los Angeles Kings. Father and son are expected to talk later Friday.