Mark Jackson, the discontented 1988 NBA rookie of the year, was suspended for four days by the New York Knicks on Friday for what a team spokesman called "conduct detrimental to the team."

John Cirillo, the team's director of public relations, did not specify the exact reason for the suspension, but the 6-foot-3 point guard has been publicly critical of coach John MacLeod for relegating him to backup status behind Maurice Cheeks. Jackson will miss two games during his suspension.According to broadcast reports, Jackson had an altercation with MacLeod before practice on Friday.

Subsequent reports said Knicks general manager Al Bianchi and MacLeod intended to fine Jackson for statements he made during an NBC telecast last Sunday, saying management had a vendetta against him. An argument reportedly ensued when Bianchi and MacLeod told Jackson about the fine.