Kerr hasn't featured for West Coast since tearing his hamstring off the bone in round four last year.
The 27-year-old has impressed during two WAFL hit-outs over the past fortnight and Worsfold confirmed Kerr would be right in the selection frame for Saturday's clash with Port Adelaide at AAMI Stadium.
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But although it initially seemed injuries to LeCras (groin) and Masten (knee) would boost Kerr's chances of a recall, Worsfold said it might actually play against his star charger.
"If those two were playing maybe it was a certainty Daniel might have come in, he could have played a lesser role," Worsfold said on Wednesday.
"We have to weigh up how we want to replace LeCras and Masten, what types of players (we want in and) what we think we can get out of Daniel in a full game.
"The guys who come in, we want them to be pretty fit."
Worsfold said he would consider playing Kerr as the team's nominated sub, but said the 170-game veteran needed to prove his fitness at training first.
"(He has to) get through training today (and) feel good about that. That's probably the main thing, see how he's pulled up," Worsfold said.
"Can he go flat out today and still feel really good and believe he's ready to go?
"If he gets through training, flies through it today, then he's a real good chance to play."
Worsfold said ruckman Nic Naitanui, who was a late withdrawal from last week's four-point win over North Melbourne due to a lingering shoulder injury, was a strong chance to return against the Power.
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