The Free Michael Now t-shirts were worn in support of the Liverpool fan who was wrongly jailed in Bulgaria in 2005.
"We have spoken to Liverpool today about this matter," said an FA spokesman. "We understand that Michael Shields's case is a very emotive issue and one that many Liverpool players and fans feel strongly about.
"Having heard the club's explanation we will not be taking any formal action, and we are satisfied that they understand the sensitivities around football matches being used as a platform for political messages."
FA to take no action over Michael Shields protest
Last Updated : 03-Dec-2008 byA judicial review hearing into Shields' case is due to begin tomorrow.