NEW YORK (TheStreet) -- Walgreen  (WAG) reports its quarterly earnings next week, and TheStreet's Jim Cramer says this will be a key item to watch.

Cramer notes CVS  (CVS) - Get CVS Health Corporation Report and Rite Aid  (RAD) - Get Rite Aid Corporation Report both reported great quarters, but says Walgreen has yet to report the kind of quarter that those two companies have. Cramer says if Walgreen doesn't make a blowout quarter like its two peer companies, then the stock could sell off and that would be investors' chance to buy it.

Cramer says Walgreen will become international in 2015, as it will have less costs and will be less of a hostage to the "drugstore wars" in the U.S. He expects a lot of green field expansion when Walgreen merges with Alliance Boots.

Must Watch: Cramer: If Walgreen Sells Off on Earnings, That's a Chance to Buy

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Walgreen President and CEO Greg Wasson will be leaving and while Cramer likes him, he notes many people believe a leader with a more global perspective will be able to take the company higher.

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Cramer encourages investors to use any weakness in Walgreen to buy the stock. He also says a pullback in CVS is not likely to happen, but he calls the stock "fabulous" and likes it in the case of a market-wide pullback.

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