Big Ten football coaches voted unanimously in Chicago to urge the NFL not to hold a special draft for Ohio State receiver Cris Carter. Such a draft, the coaches said, would open up "a can of worms."

OSU ruled Carter athletically ineligible earlier this month because he had signed a contract with an agent. Carter, an all-America as a junior last fall, wants to be in a special supplemental draft, like Brian Bosworth was. The NFL hasn't decided if it will do that . . .

Louisiana State's basketball program, in trouble again, will be limited to 13 grants-in-aid instead of the regular 15 for the 1987-88 academic year. The infractions cited were the result of the NCAA's investigation and subsequent one-year probation of LSU's football program.

The NCAA's Committee on Infractions also ruled that no new men's basketball recruits can sign letters of intent next spring.

The NCAA says an LSU player sold his complimentary tickets to a booster for $500, that a player's mother got free medical care and that a booster helped a player get a car loan.

Last year, the NCAA nailed the men's basketball program on nine counts. Some of the charges involved Coach Dale Brown's recruitment of Tito Horford, a 7-foot-1 center the NCAA said was ineligible to play for Houston. . .

Doug Single quit as Northwestern's athletic director, effective Aug. 31. He has been rumored to be a candidate for a similar job at Virginia. Northwestern also announced that, after next spring, it won't have any track or cross country.