An injury issue to Peter Siddle has thrown another spanner into the works for Australia as it manages its fast bowling troubles heading into the final Test of the home summer.
National selectors already face a dilemma over whether to wrap Josh Hazlewood in cotton wool for the Sydney Test but may now be more reluctant to do so with Siddle under a fitness cloud.
The veteran fast bowler bowled just nine overs on the fourth day and is believed to be battling an ankle complaint. 
Siddle left the field briefly for treatment on his ankle during the first session and though he returned to bowl a further seven overs was clearly the least used of Australia's frontline bowlers.
Although the Victorian claimed the key wicket of Darren Bravo, he was noticeably down in pace having hit the 140 km/h mark during the West Indies' first innings.
Siddle's fitness is likely to have a major bearing on how Hazlewood is managed in Sydney.
The giant quick has made no secret of his desire to play all six Tests this summer but his growing importance to the Test side means he is too valuable to risk in a dead rubber, particularly with the tour of New Zealand looming.
The generous spacing of the Hobart and Melbourne Tests has eased the demands on Hazlewood this month but he has bowled more overs than any Australian quick this summer. Nor did Hazlewood do himself any favours by costing himself the wicket of Bravo through overstepping.
In isolation, Hazlewood's 41 overs this Test would not raise red flags but the short turnaround before the third Test, starting Sunday, combined with the Windies' improving form with the bat will also be considered.
But selectors will also be wary of fielding an inexperienced attack, possibly containing two debutants if Siddle and Hazlewood are both out, no matter how weak the opposition is perceived to be.
Former Test paceman Geoff Lawson, Hazlewood's state bowling coach, would like to see the new spearhead of Australia's attack play in Sydney.
"If you're bowling and you're playing well there is no point sitting down. Josh hasn't had a huge workload this summer and he certainly didn't have one over the winter," Lawson, a vocal critic against the rotation of quicks, said on Sky Sports Radio on Tuesday morning.
"There's certainly a different view from the people who prepare cricketers these days and it takes some players to say 'I want to keep playing, I'm feeling great, I want to keep going' and that's what we need a few of the guys to do.
"The Melbourne and Sydney Tests have always been that short turnaround where you do have to be a little bit careful but as I said I think Josh in particular hasn't had a huge workload and that's when you want to keep playing.
"He's bowling superbly. Why would you want to sit out of a Test match?"
Mitchell Marsh's rapid improvement with the ball will provide comfort for selectors should they decide to rest their senior quicks, or play spin twins at the SCG.
The all-rounder, who has lifted his pace markedly, was used as a legitimate fourth seamer, capturing four key wickets.
The youngster credited Craig McDermott for the changes made during the World Cup which have cranked his pace up to the high 130s, which is comparable to the frontline quicks.
"I was bowling mid 120s, I knew if I worked hard I could get it up to mid 130s where I am at the moment," Marsh said on ABC Grandstand.
"Im running in a bit harder now which unfortunately means I push the front line like Patto [James Pattinson] does.
"Without him I'd still be bowling low 120s. I've worked really hard with my bowling and it's nice to be able to contribute with the team."