Manchester United have had a joint £28m bid for Marouane Fellaini and Leighton Baines rejected by Everton, with the Merseyside club blasting their rivals for the "insulting and derisory" offer.

The deal consisted of £16m for Fellaini and £12m for Baines. Everton insist neither Baines or Fellaini will be sold before the end of the summer transfer window on 2 September.

David Moyes, the United manager, sanctioned the offer for his two former players at the end of last week but Everton instantly turned it down.

A statement from Alan Myers, Everton's new director of communications, on the club's website said: "Everton can confirm that it has received bids from Manchester United for two players. Those bids were immediately rejected out of hand as derisory and insulting.

"The Club did not make public these details as it was vital Roberto Martínez's preparations for the opening game of the Premier League season were not disrupted in any way."

Fellaini cost around €19m (£16m at the present rate) with add-ons when Moyes bought the Belgian midfielder to Everton from Standard Liege in 2008. With United offering around the same sum it appears the club do not believe the 25-year-old's value has increased after five years of Premier League experience.

The rejection of the joint bid is the latest setback in the market for Moyes and Ed Woodward, the executive vice-president. Their pursuit of Barcelona's Cesc Fábregas, the manager's prime target, also appears unlikely to succeed after the midfielder spoke publicly about his desire to stay at the club.