The former Liverpool midfielder made the announcement via social media on Wednesday, bringing an end to his professional career that spanned nearly two decades. Adam joined the Reds from Blackpool in the summer of 2011 and went on to make 37 appearances for the club, scoring on two occasions. He earned a League Cup winner's medal in 2012 after helping Sir Kenny Dalglish's side beat Cardiff City in the Wembley final. Adam, who was capped 26 times by Scotland, left Anfield for Stoke City on transfer deadline day in August 2012.He began his career at Glasgow Rangers and also enjoyed spells at Ross County, St Mirren, Reading and, most recently, Dundee.