Tunbridge ruptured his Achilles after falling awkwardly while changing directions.
West Coast football manager Craig Vozzo said the club will consider three different surgical options; the traditional knee reconstruction, LARS surgery or a new hybrid LARS operation.
“In his case we do,” (consider LARS options),” Vozzo said.
“He is a rookie and it is a pretty important year for him, so we are going to have our doctors give us some recommendations over the next couple of days.
“There will be three possibilities — the traditional knee reconstruction which means out for the 10 to 12 months, the LARS which is a three-to-four-month recovery, or there is a hybrid LARS. We will have a look at that which is probably five to six months.
“With Simon we will seriously consider the different LARS options given his personal circumstances.”
The hybrid LARS involves a grated ligament and artificial fibre with a far quicker recovery time that the traditional knee reconstruction.
Tunbridge has had a wretched luck with injuries, managing just 10 games due mainly to several serious ankle injuries since joining West Coast as a rookie in 2012.
“He has never had a really good run at it and he has done a good preparation through the off-season and he was in really good nick. It is really disappointing for him,” Vozzo added.