New England coach Eddie Jones says his transformation of the national squad will not be truly felt until three years into his tenure.
Jones, who took over from the sacked Stuart Lancaster in November, said that it takes time for a new coach to have their influence truly felt on a squad.
"I'm hoping we'll see the best of this team against Ireland on Saturday, but whether that happens or not, I'm not sure," Jones said.
"You are always hoping it's going to happen next week. Sometimes it happens in three weeks, sometimes it takes three years, you don't know.
"Generally speaking, you look at most teams around the world when a coach takes over, the first year you are coaching the previous coach's team - that's the reality.
"The second year, you can change it by 50 per cent, the third year you can change it by 80 per cent. Which means, by the third year, it's your team. Now that's where you should be at your best. The third and fourth years are the years you get your maximum."
Jones' England side take on Ireland in the Six Nations on Saturday, after victories over Scotland and Wales in their opening two matches.