With fellow seamer Ben Hilfenhaus ruled out through injury and left-armer Mitchell Starc reportedly going to be rested, the door is open for Mitchell Johnson to return and Jackson Bird to make his Test debut against Sri Lanka at the MCG.
Despite the constantly changing face of the Australian pace attack, with six quicks used so far over the summer, Siddle believes the team's ability to perform together will not be affected. "Whoever's come into the squad they've known what they had to do," Siddle told reporters.
"The guys that have come in at that time have shown that they can execute their skills and work with the rest of the players in the squad to maintain that pressure. That's what the success that we've had in that time has come down to.
"The squad has changed a lot with the bowlers, but we've stuck together, we've worked well as a team. At the end of the day the right decision will be made."
The Victorian, who has already taken 18 wickets this summer, believes Bird in particular will be well suited to the MCG pitch, a ground where he has taken 14 wickets in two Sheffield Shield games with an average of 12.07.
Siddle said: "It's a very patient ground. Our game-plan works beautifully here.
"I guess I've had my success (in) a similar way to him, you bowl nagging lengths and be patient, you bowl tight lines, that's sort of been the go-to here for us.
"He's (Bird) a very similar type to those sorts of styles. He's a very talented player and his record speaks for itself.
"He's only been playing for 13 months and to have 80 wickets at very little is an outstanding achievement. He's taken wickets all around Australia and he'll be a good addition to the squad."
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