The Ghanaian international became Sam Allardyce's first signing as Eagles manager when he made the move from Leicester City in January 2017 for an undisclosed fee, and debuted against West Ham United the following day.
The left-sided player won the Premier League title at the Foxes in 2015/16 having played in 24 of their 38 league matches. He had been named the club's Players' Player of the Year the previous campaign when he helped them unexpectedly beat the drop in their first season back in the top-flight, after helped them win the Championship in 2015.
In total represented Leicester 150 times before his switch the Selhurst Park, and after making his professional debut as a striker on loan at Brentford in the 2010/11 season, he marked his first appearance for Foxes in style as he bagged a hat-trick against Rotherham United in the League Cup before gradually moving further back downfield during his career.
Born in Germany, he began representing Ghana in 2011 and was named in their squad for the 2015 Africa Cup of Nations and scored his first international goal against Mauritius in June 2015.