The Slovakian international lost his place in the second half of last season and is determined to win it back.
"Every day is a competition," said Skrtel. "You need to work hard and show your best every day in training.
"Since I came to Liverpool there have always been three, four or even five players that play centre-back.
"It isn't easy, but I try to do my best and I try to show my manager that I'm able to play."