Innes played as a trialist against Stirling Albion on Saturday and there are mixed reports about how he did at left back. However, he was due to get another chance in one of the friendlies that takes place over the next few nights, but has now been ruled out for at least the next nine months with the terrible injury.
The hunt for a left back will now resume, although Saints boss Gus MacPherson may decide to stick with a 3-5-2 instead.
Get well soon Mark and good luck for the future. Hopefully this isn't a sign that we'll suffer the sort of injury problems we did the last time we were in the SPL.