Former Australian Rugby captain says that Wallabies head coach Robbie Deans' future is safe for now as it would be too difficult to replace him before the British and Irish Lions tour.
Deans has been under pressure for his position since the start of the international season when Australia suffered a shock loss to Scotland in Australia and his position has come under further pressure during the Rugby Championship.
Australia's heavy 33-6 loss to France at the weekend which has cost the team their second place ranking has only added pressure.
The media have blasted his tactics and bemoaned the Wallabies' inconsistency under his leadership.
They next face England at their Twickenham fortress on Saturday in what could be another bloodbath.
But Mortlock said with the British and Irish Lions three-Test series of Australia looming next year, it was too late to replace Deans.
"I think it's extremely difficult when you take into consideration the Lions - which is the biggest thing for Australian rugby outside of the World Cup - is happening three-quarters of the way through the Super Rugby season next year," he told reporters.
"The reality of initiating something like that (sacking him), it would be pretty detrimental to the team and to anything we're trying to build toward the Lions."
Deans overtook Bob Dwyer as the most-capped Wallabies coach in the weekend's game against France, having been in charge for 68 Tests.
However Deans has a poor win-loss record, steering the side to just 39 victories which equates to him winning 57 % of his matches.