PORT Adelaide has been dealt a massive injury blow, with hard-running midfielder Matt White ruled out for up to six weeks with a hamstring tear.

White was subbed out of last Friday night's loss to Geelong in the second quarter, and subsequent scans revealed a grade 2-3 tear in his left hamstring.

With Jared Polec also sidelined with a stress fracture in his foot, the Power are now without two of their power runners.

On Wednesday afternoon, the Power responded to the spate of injuries by promoting Nathan Krakouer to their senior list under the rules that permit the mid-season elevation of a rookie. 

White's injury history has prompted Power high performance manager Darren Burgess to be particularly cautious with the 28-year-old speedster.

“He won’t start back running for a couple of weeks just to let it heal and then we’ll just build up strength from there,” Burgess said.

“He’s had a bit of a history with hamstrings, so we’ll be taking a particularly cautious approach with him.”

Meanwhile ruckman Matthew Lobbe has urged his teammates to remain composed against Carlton on Saturday at the MCG.

The Power are desperate for a win to square up their season at 6-6 heading into their round 13 bye.

Lobbe spoke about Geelong's ability to strip Port's players of the ball when, at stoppages, the Cats' pressure led to panicked and poor decision-making by the Power midfielders.

With more composure, Lobbe hoped Port’s players could sum up the situation with greater accuracy, which would lead to better decisions.

"Being stronger with the ball [is important] and probably not giving it quickly, just having to drive through a tackle," Lobbe said.

"You've just got to train it as best you can under that game-like pressure.

"Teams have ramped up the way they pressure oppositions … every team's modeled themselves on [Fremantle] and tried to ramp up the pressure."

Carlton has improved dramatically under interim coach John Barker, and pushed Adelaide to the limit at the MCG in round 10 before its bye.

Lobbe said the Blues were playing with greater freedom, which made them a dangerous prospect.

"Last [game] against the Crows they looked like that and I'm sure they'll be doing that again," he said.

"It means they're probably willing to run and take the game on, and be a little bit more unpredictable.

"You prepare as well as you can, but you know going into the contest that they're going to go for it."