Chip Wilson, founder of Lululemon Athletica, has escalated his criticism of the company's board as it searches for a new chief executive. In a letter to potential CEO candidates, Wilson warned that replacing Calvin McDonald alone won't solve what he views as deeper governance problems at the athleisure company.

Wilson's latest broadside comes as Lululemon continues its search for a new leader following McDonald's announcement in December that he would step down at the end of January. The founder's intervention suggests internal tensions may be complicating the recruitment process for the company's top job.

The timing of Wilson's critique raises questions about the board's effectiveness and the company's strategic direction. His public statements to prospective candidates indicate he believes the board's shortcomings, rather than leadership changes, are the root cause of Lululemon's challenges.