Ramdin was last Friday elevated to the post after the West Indies Cricket Board sacked Windward Islands all-rounder Darren Sammy, reports CMC.
"I have been playing with Denesh since Under-15 cricket and he has always demonstrated that he has what it takes to be a leader," Simmons told the Trinidad Guardian Friday.
"Denesh has always been someone full of confidence and determination to do well. This has rubbed off on the teams he has captained and the results can show that."
He added: "Denesh has shown his best under pressure. He gives you the impression that he can come out of any fight on top and this is what you need from your leader."
Ramdin has served as the West Indies vice-captain for several tours and has formally led the regional side in one One-Day International and three Twenty20s.
He takes over a side ranked number eight in the world and which is still reeling from heavy losses to India and New Zealand last year.
Simmons, who played the last of his eight Tests three years ago, endorsed Ramdin's personal qualities to handle the peculiar challenges of the role.
"He has captained me in all formats of the game and has been successful and has what it takes to lead our West Indies team at this point in time," the 29-year-old pointed out.
"I'm sure it's a challenge he would welcome and he has the respect of all the players, so I know he would serve the West Indies proud."