The 33-year-old was part of the Spain sides which lifted the 2010 World Cup, Euro 2008 and Euro 2012 titles.
Moreno says Ramos, who will make a record 168th appearance for Spain when La Roja play Norway on Saturday, will need to demonstrate the team would benefit from his presence at the Olympics.
Asked if he would make it into the Spain team, Moreno was clear. I don't want to disrespect anyone.
Spain gave Norway plenty of chances throughout the second half and it came back to bite them in stoppage time when keeper Kepa Arrizabalaga clattered into Omar Elabdellaoui and referee Michael Oliver pointed directly to the spot.
"I'm sorry, but no", Moreno said.
"I liked the attitude of the team, but not the first half".
On the game he added: "It was complicated to play against a team that, if they lost, would be out of the Euros and it was a pity they scored against us at the end".
No matter the result between Romania and Norway on Tuesday, Spain would not be able to qualify unless they collect a point from their own match.
"They go insane when there is a team that has nothing to lose, and that's what happened to Norway".
Spain's line-up to face Norway included players from 11 different clubs, with Moreno accepting it might be beneficial were clubs such as La Liga giants Barcelona or Real Madrid providing more talent to his squad.
"The fair thing is for everyone to maintain a high performance, but Sergio, who I see training every day, will maintain his level".