The Philadelphia Phillies are expected to offer left-hander Cole Hamels a contract extension of roughly $130 million over six years, reports Jon Heyman of CBSSports.com:

The Phillies are sending signals that they are planning to make an initial offer to star lefthanded pitcher Cole Hamels for about $130 million over six years within the next few days, people familiar with their thinking told CBSSports.com.

Heyman adds sources have indicated that the Phillies are interested in "doing a deal in the range of Matt Cain’s six-year agreement" with the San Francisco Giants. While Cain’s extension was for five years, Heyman notes that it, plus the right-hander’s $15 million 2012 salary, adds up to $127.5 million in commitments over the next six years.

Heyman says the Phillies are "very committed to trying to bring back Hamels," and there’s an indication that their initial offer could increase.

Last week it was reported that the Phillies were preparing a "substantial" offer for Hamels. Heyman reported yesterday that Philadelphia was willing to offer the left-hander at least $120 million.

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How much will Cole Hamels ultimately receive?

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