Date of birth
Republic of Ireland
Pompey completed the capture of versatile midfielder Williams in the summer of 20201.
The Republic of Ireland international – who is also comfortable in defence – began his career in his homeland with Drogheda and Sporting Fingal, enjoying cup glory and Europa League football with the latter.
He moved to MK Dons in March 2011 and impressive displays during the 2012/13 campaign saw him named 'Player of the Year' by both supporters and team-mates.
Williams then signed for Millwall at the start of 2014 and appeared at Wembley when they beat Bradford to win the 2016/17 League One play-off final.
He struck 22 goals in 295 appearances for the Lions, featuring 22 times in the Championship last term.
Williams has been capped three times by his country and netted in a 2018 Nations League clash with Wales.