The body of Odin Lloyd was found June 17 near Hernandez's home. Police arrested Hernandez on Wednesday and charged him with orchestrating the execution-style shooting.
Members of Lloyd's football team chanted his name Saturday as pallbearers placed his casket in a hearse outside Church of the Holy Spirit in Boston's Mattapan neighbourhood.
Prosecutors allege Hernandez arranged the killing because Lloyd talked to the wrong people at a nightclub.
Hernandez has pleaded not guilty and is being held without bail. Two other men are also in custody. Prosecutors say the three were with Lloyd shortly before his death.