Manchester United and England midfielder Michael Carrick has been ruled out for three weeks with an Achilles injury.[LNB] The 29-year-old had an injection on Thursday after informing Sir Alex Ferguson the long-standing problem was starting to bother him once more.[LNB]"He should be out for three weeks, maybe a month at most," said Ferguson.[LNB]Carrick was an unused substitute during England's recent Euro 2012 double-header but has not started a game for United since the Community Shield triumph over Chelsea at Wembley last month.[LNB]"He has had a problem with his Achilles," added Ferguson.[LNB]"It has been bothering him for a few weeks now, so we sent him to a specialist in London yesterday and he had an injection.[LNB]"We are hoping that settles it down.[LNB]"We have been considering what we should do about it. The best thing is to get it treated and out of the road now because everyone in the squad is fit."[LNB]It means Carrick will miss Saturday's visit to Everton, plus the home matches with Rangers and Liverpool that follow in a busy week.[LNB]However, Ferguson will have Rio Ferdinand available for the first time this season after the defender made a quicker than expected recovery from the knee injury he suffered on the first day of World Cup training in South Africa.[LNB]"Rio Ferdinand could have played for the reserves against Stockport last night," said Ferguson.[LNB]"He wanted to play but his training performances are so good I didn't see any point.[LNB]"He is in the squad. With three games this week, it is good that he is back in the fold."[LNB]Brazilian midfielder Anderson is unlikely to be involved on Saturday after picking up a slight knock on reserve team duty on Thursday night, although Ferguson does not believe the injury is too serious.[LNB]"Anderson came off with a little niggle yesterday but it is nothing serious," said the United chief.[LNB]"It is just the fact he has been out for a long time and he is just coming back.[LNB]"I don't think it will knock him back any length of time."