Montreal Expos -- Signed P Andy McGaffigan, P Jack O'Connor and P Rick Stoll for a year. Invited P Curt Brown, P Floyd Chiffer, P Dave Tomlin, C Wilfredo Tejada, C Ned Yost, IF Jim Anderson and IF Wallace Johnson to camp.

San Francisco Giants -- Signed P Atlee Hammaker and P Mark Davis for a year; sold IF Fran Mullins to Cleveland. BASKETBALL

Los Angeles Lakers -- Magic Johnson probably won't play against the Los Angeles Clippers tonight and might not play against Denver Saturday. He has a swelled knee.

Milwaukee Bucks -- Signed center Earl Jones, 6 feet 11, to a second 10-day contract.

Madison Square Garden -- John Goldner, who was instrumental in guiding the growth of college and professional basketball in New York, will retire Feb. 1 after 50 years with the Garden. COLLEGES

East Carolina -- A university report alleged violations of NCAA rules during Ed Emory's tenure as head football coach; he was fired in 1984. The report said the violations included unauthorized financial assistance to student athletes, maintenance of unauthorized bank accounts, use of graduate assistance for offcampus recruiting and attempts to circumvent eligibility requirements.

Marshall -- Announced resignation of assistant football coach Joe Redmond.