The 68,000-seat stadium, the home of Russian football powerhouse Zenit, will be a flagship venue at the 2018 World Cup. But the pitch had to be hastily re-laid after it was cut up during the inaugural match there in April.
Prior to the problems with the grass, issues with the stadium's retractable pitch technology also caused the playing surface to vibrate, rendering it unfit for matches.
Colin Smith, director of competitions for global soccer body FIFA, told reporters that the stadium's "young pitch" had sustained damage from the matches, as well as from warm-up sessions.
"We did significant top dressing last night," Smith told reporters at a news conference in St Petersburg.
"Tomorrow we will fully cover the pitch and really regulate the temperature and the growing conditions in there. We're confident that it will be a good playing surface for the final."
Smith said greenhouse structures had been installed over the pitch's weaker areas and grow lights have been permanently set up. He added that rainy weather conditions had "not helped the growth of the problem areas" on the pitch.
Portugal captain Cristiano Ronaldo and coach Fernando Santos both criticized the pitch after their 4-0 win over New Zealand on Saturday, with Ronaldo telling Portuguese media the grass was too long.
Santos said the teams were prevented from training on it the day before the game.
Smith said the group stage of the Confederations Cup had been a great success on the operational level but that there was room for improvement ahead of the knock-out stage, which begins on Wednesday.
"Very importantly, these improvements will also serve as very valuable lessons looking ahead to next year’s FIFA World Cup," he said.
Portugal face Chile in the first semi-final on Wednesday in Kazan, while Germany take on Mexico in Sochi the next day. The winners of the two semi-finals will play for the title on Sunday in Saint Petersburg.
(Reporting by Moscow Newsroom; Editing by Jack Stubbs and Hugh Lawson)
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