The deal marked the 32-year-old's third spell at Millwall having previously played for The Lions between 2009 and 2011 and then on loan during the 2013/14 season. During those two previous stints combined Morison netted an impressive total of 48 goals in 137 appearances for the club.
The powerful frontman began his career at Northampton Town but it was with Stevenage where his reputation soared. After netting 76 goals in 142 games for The Boro, Morison signed for Millwall in 2009 under then manager Kenny Jackett and went on to play a pivotal role in the club's promotion to the Championship that season.
Just a few months later he earned his first call-up to the Welsh national squad, making his debut in a 5-1 win over Luxembourg. Morison continued his impressive form in front of goal throughout the 2010/11 season and hit the back of the net 17 times as The Lions finished ninth.
In June 2011 the striker joined Premier League side Norwich City and went on to score 12 goals in 59 games before making the move to Leeds United in January 2013.
But just six months later Morison was back at Millwall on a season-long loan deal from Elland Road, during which he added eight goals to his tally for the club, including a vital winner away at Derby County which helped The Lions on their way to earning Championship safety.
Morison returned to Leeds for the start of 2014/15 to fight for his position and he did so successfully, making 26 appearances and finishing the season with two goals in his final three games for the club.
His return to The Den came so close to having a fairytale finish with promotion as Steve, who signed an extended contract in February 2016, ended the campaign on 19 goals - his best return since 2009/10.