Kansas City Chiefs safety Husain Abdullah announced his retirement Monday on Instagram, citing suffering the fifth concussion of his seven-year NFL career as a contributing factor in his decision.

After 7 years in the NFL, I am retiring. I would like to thank the Minnesota Vikings for giving me an opportunity to make the team after going undrafted in 2008. I experienced a great deal of growth both as a football player and as a person during my 4 years in Minnesota. Thank you. The Kansas City Chiefs will forever have a special place in my heart. After sitting out of football to fulfill my Hajj Pilgrimage in 2012, The Chiefs were the first to call. The three years I spent playing for KC may have been the most enjoyable football experience in my entire life. Thank you. There are numerous deciding factors in my decision, with personal health being foremost. Sitting for five weeks last year after suffering the fifth concussion of my career, I had a lot to contemplate. My goals moving forward are to be of benefit to my family, my community, my country and hopefully the world. Having a sound mind will be vital in accomplishing these goals. Thank you to everyone I've crossed paths with during my time as a player. You've had an impact on my life for the better. Thanks for the love and support. It's greatly appreciated. #chiefskingdom #Peace

A photo posted by Husain Abdullah (@habdullah39) on

Abdullah, 30, missed the final five games of the 2015 season. He signed with the Chiefs in 2013 after taking 2012 off to complete The Hajj, a pilgrimage to the holy city of Mecca.

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His brother Hamza -- a seven-year NFL veteran at the time -- did the same, but he never played another game. Husain Abdullah not only returned but started 21 games for the Chiefs in his three seasons in Kansas City.

Abdullah was an undrafted free agent in 2008 and spent his first four years with the Vikings.