Neil Wagner said New Zealand can only cross its fingers and hope debutant Lockie Ferguson has not bowled his last ball in the first Test against Australia.
The Black Caps paceman pulled up with a calf injury on day one at Perth Stadium after bowling just 11 overs.
Ferguson went for an MRI scan to discover the extent of the damage, leaving the tourist a bowler down as Marnus Labuschagne (110 not out) made a third consecutive Test century.
Wagner, who took 2-52 as Australia closed on 248-4 in the day-night contest, felt for Ferguson as New Zealand waits to discover how serious his injury is.
The seamer said: "It's gutting, isn't it. It's pretty heartbreaking and I know he'll be devastated.
"We'll all get right behind him and hopefully it's not too bad. We haven't heard anything back yet so hopefully it's good, or better news than what everyone is expecting."
Wagner added: "Hopefully we'll find out [the results] pretty soon. Fingers crossed it's not too bad, he's a quality player and we would have loved to have seen him bowl more."
New Zealand, already without left-arm seamer Trent Boult due to a side strain, will assess Ferguson's fitness prior to Friday's play in the series opener.
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