ADELAIDE'S injury curse has claimed another victim, with skipper Simon Goodwin in doubt for Sunday's game against Melbourne at the MCG with a corked knee.

Goodwin, 33, sustained the injury during the loss to the Sydney Swans last weekend, but was able to play out the game under duress.

The five-time All-Australian will need to pass a fitness test later in the week before being considered for selection.

Utility James Sellar (hamstring) has already been ruled out of the clash, but Scott Stevens should return to the side after a week on the sidelines with concussion.

Forward Chris Knights is also in line for a recall after an impressive performance for Woodville-West Torrens on the weekend.

Midfielder Nathan van Berlo (back) was a late withdrawal from the team that lost to the Swans, but the club is hopeful he'll be able to train on Thursday.

Defender Graham Johncock (finger) is still at least a week away from returning.

The Crows made five changes to the side that lost to Fremantle in round one and appear set to make at least another two this week.

The club has been reluctant to use injuries as an excuse for its slow start to the season, but on Tuesday veteran Michael Doughty conceded the revolving-door medical room was impacting on the team's performance.

"We won't use injuries as an excuse, but they do affect your balance and your ability to get guys out there training together," Doughty said.

"It's showing in games that our intensity is not consistent compared to last year when we went into the finals series and everyone was up and about. We haven't had that consistency of blokes out on the park and we're a bit up and down at the moment."

Adelaide has lost its opening two games to non-finalists from last season, Fremantle and the Swans.

Doughty said the early results proved that some sides have improved dramatically over the pre-season.

"We've seen a greater level of improvement from sides this year (compared to last year) and our standard hasn't been anywhere near the mark we set ourselves for," he said.

"We take responsibility for that as players, but we know our best is good enough. We showed in parts on the weekend that we can control the game, but when you get a seven-goal blow out in the second quarter it hurts your confidence."

The Crows' once-revered zone defence fell apart against the Swans last weekend, with five-goal forward Ben McGlynn finding space over the back of the zone on numerous occasions.

Coach Neil Craig blamed some his side's leaky defence on inexperienced personnel, prompting calls for a revised game plan until a handful of the club's seven first-choice players on the injury list are able to return to the side.

Doughty denied the zone was Adelaide's only problem in the opening two rounds.

"We're losing centre bounces, clearances and our intensity around the ball (is down). It's not just one area (the zone) that we're falling down in; it's numerous areas, so if we can get a few of them right you'll see our performances change."