World Cup finalists England and South Africa are the "two most powerful rugby teams in the world" according to John Mitchell.
The New Zealander - who is England defence coach under Australian Eddie Jones - pointed to both teams' strengths at the gain line and their kicking, ahead of the final on Saturday.
England defeated the All Blacks while the Springboks beat Wales in the last four, with Mitchell impressed at South Africa's speed in the wide areas and England's adaptability.
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"What we do have, or what we are going to witness, is the two most powerful rugby teams in the world," he said.
"They are strong, they are well coached and the gain line is going to be huge.
"I guess it's a testament to both sides. We feel we have more in ourselves, more to bring out and will we work very hard for each other.
"You've got two of the most powerful rugby teams at the moment, who both love dominating the gain line and both love kicking. Both teams are effective in that particular area.
"We feel we are very adaptable as well, we don't just play one way, so that is one of our strengths.
"The Boks have got very fast wingers that can finish, very capable kickers left and right and huge guys who love carrying the ball."
England duo Owen Farrell and Jonny May returned to training on Tuesday morning after Jones confirmed that both were fit on Monday.