Scotland, 32, only missed one game through injury in 2012 and was the Blues leading possession winner with 553 at an average of 26 a game.
He joined Carlton at the end of the 2003 season in a trade with Collingwood for a second-round draft selection (Brent Hall) and will enter his 15th season in the AFL.
"Even in his 30s, Heath is one of the hardest working and most consistent players on the Carlton's list," Blues football manager Andrew McKay said.
"His on-field performance and leadership throughout the past two seasons has been significant and we would expect him to be one of the leading contenders for this year's best-and-fairest."
Meanwhile Blues officials this week informed McLean's manager Dan Richardson that the former Demon was part of new coach Mick Malthouse's plans.
After struggling with injury and form in his first two and a half seasons at Carlton, McLean hit form in the second half of 2012 and finished ranked third at the club in disposals per game and fourth in clearances, contested possessions and tackles.
"It's good news for him and a good reward for hard work," Richardson told the ''Herald Sun''."They have indicated to us that he's a required player. We'll work through all the details of that, but it's obviously a positive start in that regard."