The Real Madrid star was at the centre of a contract dispute with his club last summer.
United tried to sign the centre half, while Los Blancos were keen on paving a return to La Liga for David de Gea.
Though Ramos claims he contemplated a switch to Old Trafford, he said money wasn't at the root of the problem with regards to the contract stand-off with Real.
"There was an offer from United," Ramos said.
"I considered changing for a while but Real Madrid was always my priority and there were no economic reasons."Â
Recent reports suggested Chelsea launched a £64million bid for Ramos.
Sergio Ramos - Spotlight on
It is thought incoming Blues boss Antonio Conte is keen to make some defensive reinforcements, with Ramos on his wish-list.
But Ramos claims he is unaware of speculation linking him with a move to Stamford Bridge.
"I have not heard about [interest from Chelsea]. Many things have always been said," Ramos said.
"Flattery from big clubs is always good as this is because you are doing well, but if the fans and my club want me."