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So it may be that Roberto Martinez and Leighton Baines could both "see red" in the next few days.
The Welsh full back was arguably the best in Europe last season. If, as has been rumoured by the likes of The Guardian, Monaco want Patrice Evra, then Baines is by far the best replacement, despite the competing claims of Alex Buttner and the returning Fabio.
Now, there is always plenty of opposition and even United fans who moan that the Red Devils cannot compete in the transfer market with billionaire owned clubs like City, Chelsea and Monaco.
Nevertheless, depending on which paper you read, Moyes will have a transfer budget of between £60 million and £80 million this summer, of which he has so far only spent £1 million (on Guillermo Varela).
And the likelihood surely is that this would be a net sum. The only other question is whether it would be augmented by, say, Nike and/or Chevrolet to expedite the "marquee" signing of Ronaldo.
It is possible that the Portuguese maestro would not arrive at Old Trafford until next season. His contract is running down and the fee would be lower; both he and Carlo Ancelotti (if the latter arrives as Real Madrid manager), may want to look at each other; Ronaldo might wish to see how Moyes gets on in his first season.
But from United's and probably the player's point of view, it would surely be better if the deal is done now or not at all. A £65 million offer was suggested as long ago as March, the reduction on his £80 million fee on moving to Real Madrid being explained by age and the remaining contract life.
Anyone like me, who was at the home leg against Real Madrid, cannot fail to have been as moved as the player at the warmth of feeling towards him. In which case, whatever offer Monaco might put together should be irrelevant.
We should also remember the players that Moyes might be prepared to release. Even if he decides to give Nani another chance (and assuming the player moderates his wage demands), there are other players that United fans would probably not miss, like Anderson, Ashley Young or Antonio Valencia.
That is not to say that either of the latter two will be sold. There are other possibilities. While Bebe would probably command only a nominal fee, Federicho Macheda could be worth a few million.
The truth is that we don't know who Moyes would be happy to part with until we see his signings. Surely he will get that business out of the way first, with two months to sell any players who are leaving.
So what would be the ideal strategy or "Plan A"?
If Ronaldo comes in, United doesn't need another striker, whether or not Rooney stays. In addition to Robin van Persie, Hernandez and Welbeck, they have talented youngsters coming through like Will Keane, Angelo Henriquez, Nick Powell and Wilfried Zaha.
Behind them are James Wilson and Jack Barmby. And don't forget, if Moyes plays Kagawa "in the hole," he only needs to start one striker, especially if Ronaldo is on the pitch.
So whoever leaves the club, the ideal signings would surely be Ronaldo, Thiago, Strootman, Garay and Baines. All of them would be first choice starters.