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NEW YORK ( TheStreet) -- Here's what Jim Cramer had to say on CNBC's "Squawk On The Street" Tuesday: Cramer said investors shouldn't touch the newly minted stock of Manchester United ( MANU). "Go see them in action but don't take any action in the stock," he said. Medivation ( MDVN) had some big news on a late-stage prostate cancer treatment that is "a very big deal," he added, noting the company's shares aren't done rising. The stock is a winner, Cramer concluded. In contrast, Cramer said that a recent upgrade of GameStop ( GME) has him scratching his head. "I don't know what they see here," he said, and advised using the strength to sell. Cramer was bullish on Apple ( AAPL), a stock he owns for his charitable trust,