"I'm not happy but what can I do?" Shevchenko told a Croatian newspaper. "I'm quiet and work hard in training every day."
While Shevchenko struggles to score in the Premier League - he has only scored five goals since his arrival in 2006 - he holds an impressive goals-per-game ratio on the international stage.
"The biggest joy for me is playing for Ukraine," the 31-year-old said.
"Every time I'm with the national team, I recharge my batteries which run low in London because of the things that are happening to me.
"I'm very happy when I'm at home and I just can't wait for the next games."