Starbucks (SBUX) stock dropped as much as 6.4% in premarket trading on Wednesday as the coffee giant's second quarter earnings report disappointed Wall Street and cast a shadow over its CEO's plan to turn around the company.

By Juveria Tabassum (Reuters) -Starbucks faces challenges in reviving its business, CEO Brian Niccol said on Tuesday, after the coffee giant posted disappointing global comparable sales and profit with inflation and economic uncertainty driving up costs and dampening U.

Key Takeaways Starbucks plans to report fiscal second-quarter results after the market closes Tuesday.The report marks the third since new CEO Brian Niccol took the role in September.Analysts expect quarterly revenue to improve year-over-year for the first time in more than a year.