The extent of the injury will be determined by the amount of ligament damage Beattie has suffered. Saints physio on Beattie's injury: "The first X-rays showed no break, but we may need to do more as a precaution just to make sure.
"Ligament damage can be just as bad so we are hoping that is not the case. It is still too early to make a guess at how long he will be out but it will be several weeks.
"We need to let the swelling subside before we can make a more accurate judgement."
A two month lay off will enable new signings Delgado and Ormerod a chance to get plenty of first yeam action. Delgado, in particular has impressed although Ormerod has done well in a number of brief substitute appearances.