Keryakoplis played for Liverpool for three consecutive FA Women’s Super League seasons and finished as the Reds’ top scorer in 2012.
After finding playing opportunities limited, Keryakoplis moved to Stoke City, of the FA Women’s Premier League Northern Division, in August 2013.
Having represented Wales at U17 and U19 level, the Penyffordd-born striker made her senior debut aged just 17 in 2011 and currently has 20 caps and three goals to her name. Keryakoplis is also the current Young Player of the Year for Wales.
Blues Ladies boss David Parker said: “Hannah is a player I have admired for some time now. When watching her play for Liverpool and Wales in the 2012 season she stood out for me as a player to watch in the coming years.
“She’s a young tenacious player who has all the attributes to be a modern centre-forward and is another player who fits in well with our philosophy at the football club.
“She will add a different dimension to our strike force next year and it’s a great pleasure to see such an enthusiastic player that has chosen to join us for all the right reasons and to progress her footballing development.”