'Personal health' primary reason for Husain Abdullah to retire

— -- Free-agent safety Husain Abdullah announced Monday that he has decided to retire, posting on Instagram that his health was the primary deciding factor after suffering five concussions in his seven-year career.

Abdullah thanked the Minnesota Vikings for signing him as an undrafted free agent in 2008 and called his three seasons with the Kansas City Chiefs "the most enjoyable football experience in my entire life."

The 30-year-old Abdullah had been a valuable defender for the Chiefs since he joined the team as a free agent in 2013. Kansas City used Abdullah, a part-­time starter over his three seasons, in a variety of roles. He was effective as a blitzer, though he had just a half-­sack with Kansas City, and was used a lot in man-­to-­man pass coverage.

Abdullah, who scored twice on interception returns in his three seasons with the Chiefs, had two picks against Andrew Luck in a playoff loss to the Colts after the 2013 season.

Before joining the Chiefs, Abdullah was a part-­time starter for four seasons with the Vikings. He took the 2012 season off to make the Muslim hajj to Mecca then joined the Chiefs in 2013.

ESPN Chiefs reporter Adam Teicher contributed to this report.