With Tom Mitchell touch-and-go for the early rounds as he recovers from an off-season shoulder reconstruction, Clarkson said
Finn Maginness presented an option but that the second-year prospect would need to add other strings to his bow.
"Physically he's ready, it's just about learning the game and the craft," Clarkson said.
"He's played all of his junior footy predominantly as an inside midfielder and he's not going to, right at this point, replace (James) Worpel or (Liam) Shiels or (Jaeger) O'Meara or Mitchell in that inside space.
"We need to teach Finn Maginness how can he play a little bit of wing, a little bit of half-back, a little bit of half-forward.
"But we also need to teach O'Meara and Mitchell to play other positions, too."
With Chad Wingard already used in the forward/midfield split, Clarkson nominated Breust, Dylan Moore and draftees
Tyler Brockman and
Seamus Mitchell as other considerations.
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