After being released by home town team Portsmouth F.C. in 2004, Angus was offered a soccer scholarship at Saint Louis University. During this time he had a successful college career, receiving numerous awards, including - 2008 NSCAA All American First Team, 2007 NSCAA All American Second Team, A10 Defender of the Year, and was Two time First Team All Region.
\r\n\r\nHe also made eight appearances for local USL Premier Development League side St. Louis Lions, managing to score two goals during his time.
\r\n\r\nAngus was invited to the 2009 MLS Player Combine in Florida for the 2009 MLS SuperDraft. Due to a strong college career, numerous pundits and journalists predicted him to go reasonably high in the draft, so it was a surprise when he went undrafted. Major League Soccer side New York Red Bulls offered him a trial, but he declined. However, soon after he signed with USL-2 side Wilmington Hammerheads, a team in the 3rd tier of American league soccer.
\r\n\r\nIn June 2009 he went on a trial with Swedish side GAIS and on 8 July the club confirmed signing of Calum Angus. Angus made his debut for GAIS against Halmstad BK on July 12, 2009. Calum came off the bench in the 81st minute and scored the equalizer for GAIS in the 90th minute of the match.