The GM logo is seen at the General Motors Assembly Plant in Valencia, Venezuela April 21, 2017. REUTERS/Marco Bello

(Reuters) - General Motors CoGM.N said on Saturday that proxy advisory firm Institutional Shareholder Services has recommended that shareholders vote against a slate of directors proposed by hedge fund Greenlight Capital and reject the hedge fund's plan to divide GM shares into two classes.

The advice from ISS is a setback for Greenlight and its manager David Einhorn. They have said GM shares are undervalued and would be more attractive if the company divided its common stock into shares that pay a dividend and shares that would reflect the automaker’s growth potential.

Greenlight also has proposed a slate of three candidates for GM’s board of directors.

On Friday, advisory firm Glass Lewis also advised against Greenlight’s nominees for the automaker’s board and its share split plan.