Do not forget that he is only 26. He will only improve for the next 5 years and he has 7-8 of his best years ahead. A better year for him this year, and more to come without a doubt.
EDIT - Just to add to this - Look at the ages of our back line, and it tells you that our best years are most definately in front of us:
Kenny 21, Keane 26, Mina 24, Digne 25