Manchester United supremo Ed Woodward has sent Chelsea a ‘terse’ letter warning them to make no new bids for Wayne Rooney.

Chief executive Woodward - backed by the champions' American owners - put his views in writing in a ‘Dear Roman...’ message aimed to block a new bid.

United have turned down two offers for unsettled Rooney from the Roman Abramovich-owned Londoners and are expected to knock back a third.

Woodward hope that the letter - which asks Chelsea not to make any further bids and to stop commenting on Rooney while spelling out United have no intention of selling the England forward - would see an end to the summer-long transfer saga.

However Chelsea boss Jose Mourinho plans to go to £40million for Rooney on Monday when the two sides play at Old Trafford.

He also wants to know if United are prepared to compromise on their public position over the player’s future.

After Chelsea’s win over Aston Villa on Wednesday the Special One said: “We did (bid) before and we will do later but I think this period [ahead of Monday's match] – from the ethical point of view – is a period when we are going to be quiet and just thinking about that game.”

In private Mourinho is bullish about his chances of landing Rooney before the September 2 transfer deadline.

Chelsea know it will be hard to land their Plan B - Borussia Dortmund striker Robert Lewandowski - but want a clear answer from United on Rooney before going official with that option.

The Stamford Bridge club believe that an identical £40m offer plus a £300000-a-week wages package may yet prise the Pole from Germany.