Tottenham managed to pip Manchester City to fourth spot during their clash at Eastlands on Wednesday.
“I think if they’d have finished fourth this year they’d have been an even bigger threat next season,” Ferdinand told the Guardian.
“They can attract the players from Europe, [and] people would have been enticed to go not only for the money but because they were going to be in the Champions League.
“So them not finishing there, I don’t think we fear them but we’re aware of them.”
“I’ve been at United for eight years – and probably up until last season when the money was injected into City, Liverpool was a bigger game in terms of rivalry.
“I think now they have the money we’re more aware of them.”