They join the growing United casualty list which already includes names such as Vidic, Anderson, Lindegaard, Owen and FletcherRyan Giggs, Dimitar Berbatov and Patrice Evra have all failed to make the Manchester United squad for their Europa League trip to Ajax.
While both Evra and Giggs played the full 90 minutes in the weekend's highly-charged clash with Liverpool, Berbatov was named as an unused subsititute so was possibly carrying a knock already.
The trio join the long list of United absentees which already includes names such as Vidic, Lindegaard, Anderson, Fletcher and Owen.
Better news for United on the injury front, however, is the inclusion of Tom Cleverly.
The 22-year-old has been out since the end of October, having limped off in the win over Everton. Having resumed full-training just a few weeks ago, the youngster was named as an unused-substitute in the weekend win over Liverpool, and could well make his United return on Thursday.