WWE raw 2011 started with WWE Championship match between Miz and Randy Ortan where Miz retained the title but John Cena was nowhere to be found on the 3rd Jan raw. Last week John Cena was attacked by Nexus members and punk. He was reported injured on 3rd Jan 2011 raw. 

According to sources, Cena has experienced a number of injuries recently, as the rough WWE schedule seems to have taken a toll on his body. However, it should be noted that all of these injuries are minor, and Cena is expected to be back as soon as next week's Raw. With the Royal Rumble coming up, Cena won't have to risk his body any further in a singles match.