Starc, with 12 wickets, is the leading wicket-taker in the ongoing tri-series including India and England, performing the role of pace spearhead well in the absence of Mitchell Johnson.
"We do have two spearheads from that point of view," McDermott told the Herald Sun.
"Mitchell Starc is swinging the new ball. It is certainly going to swing for him in Perth. He is a real weapon if he gets it right and the ball is swinging early.
Giving an update on Johnson's fitness ahead of the final in Perth on Sunday, McDermott said the left-arm pacer has been working up good pace in the nets.
"He has had a lot of cricket over the last little while and he is always bearing the brunt of a lot of overs. His rhythm looked good.
"We have had some pretty non-responsive wickets during the Test series for our pacemen. Everybody is looking forward to having a bowl at the WACA for the first time this summer," added McDermott.
