Rovers boss Owen Coyle bolstered his defensive options with the permanent signing of Derrick Williams from Bristol City on a three-year-deal for an undisclosed fee.
German-born, Williams came through the youth ranks at Aston Villa, making his Premier League debut under Paul Lambert at QPR in December 2012.
The versatile defender joined Bristol City in June 2013 and made 48 appearances in his debut season at Ashton Gate.
The 2014-15 campaign would be a memorable one for both Williams and Bristol City, who romped to the League One title and beat Walsall 2-0 in the Johnstone’s Paint Trophy final at Wembley in March.
Williams played a prominent role in both competitions – starting 44 of the 46 League One games and an ever-present in the cup success.
The 23-year-old made 24 league appearances, scoring one goal, as Robins secured their Championship status last season.
A Republic of Ireland Under-21 international, Williams leaves Ashton Gate with 131 appearances to his name.