Manchester United midfielder Anderson is out until February with a knee injury, Sir Alex Ferguson has said.
Anderson, 23, missed a large part of 2010 with a knee injury and has been sidelined again since picking up the problem in the UEFA Champions League win over Otelul Galati at the start of November.
The complaint was not originally thought to be serious, but the Brazilian has now travelled to Portugal to see a specialist, which will keep him out of action well into the New Year.
''Anderson is out until February with a knee injury,'' Ferguson said. ''He's been sent to Portugal to see a specialist who operated on him before. Not good news.''
The news throws into chaos Ferguson's midfield plans given Tom Cleverley is also currently out of action with an ankle injury. However Ferguson, who was heavily linked with Luca Modric, Samir Nasri and Wesley Sneijder during the summer transfer window, insists he has no plans to dip into the January market.
''It is easy to say you are going to buy players but it is not easy to buy them for Manchester United, especially in January,'' he said. ''I do not see anyone who could make us a better team. There are two or three players but they are not available, so there is no point even going there.''