Shaun Williams will leave Millwall when his contract expires next month.
The long-serving midfielder made 295 appearances for Millwall, scoring 22 goals, across a seven-year period after signing from MK Dons for an undisclosed fee in January 2014.
Making his debut in a 1-1 draw at home to Sheffield Wednesday as a 60th-minute substitution for Nicky Bailey that month, Williams made 17 appearances in his first half-season with the club and scored his first goal from the penalty spot in a 2-2 draw with Blackburn Rovers at the end of March.
With The Lions retaining their Sky Bet Championship status, the Irishman did not have to wait long for his second strike - again from 12 yards - as he scored in a 2-0 opening-day victory over Leeds United in 2014/15.
After 'taking one for the team' late on in a 3-3 draw with Wolverhampton Wanderers, the midfielder returned from suspension to score his first goal for the club in open play with just two minutes to play against Blackburn to draw 2-2.
The Lions were unfortunately relegated to League One that year, but it was under Neil Harris in the third tier in which Williams started to flourish. The Irishman scored four times in 43 appearances as the club lost out to Barnsley in the 2015/16 Play-Off Final, before a mammoth 56 matches were played the following campaign as Millwall went one better, defeating Bradford City at Wembley to gain promotion.
It was to be Williams who would provide the crucial cross which was to be nodded on by Lee Gregory and into the path of Steve Morison to score the winning goal, but other memorable moments in that season included an incredible goal from the halfway line in an EFL Cup tie against Nottingham Forest, and the first goal in an outstanding comeback at Bury in November 2016, in which The Lions came from 2-0 down to win 3-2 in the last minute.
Williams' 2017/18 season, in which he played 40 times, scoring twice - including the fastest goal of the season in the first minute at home to Nottingham Forest - earned him deserved recognition at international level, as he made his Republic of Ireland bow in a friendly against soon-to-be World Champions France, replacing Kevin Long with 10 minutes to play.
The Irishman's international career experiened a bright start as, in just his second appearance for the Emerald Isle, he found the net in a Nations League tie against Wales in Cardiff. The 2018/19 season was the midfielder's best scoring season with The Lions, as he hit the back of the net six times, including a Goal of the Season contender in a 1-1 draw at Bristol City.
Now a senior member of Millwall's set-up, Williams played 34 times in 2019/20 and scored back-to-back strikes against Birmingham City and Nottingham Forest, before his 29th and final appearance of the 2020/21 campaign brought the curtain down on a fantastic career for the club, skippering the side for the second-half on the final day against Coventry City.
In nearly 300 appearances for the club, Williams provided a calming influence on the pitch and on the ball, as well as an outstanding range of passing and much, much more.
Everyone at Millwall would like to thank Shaun for his outstanding service to the club and wish him all the very best for the future.