Signed from CSKA Moscow for €19.6 million by Claudio Ranieri, Musa has never quite been able to nail down a spot at Leicester, making just 14 starts in almost two seasons, which just about serves as a damning indictment of what his time at the King Power Stadium has been like.
"I am back to the red-blue family".
"I am happy and proud to be back".
"This is truly my home, champion team that fights for the top awards and occupies highest places".
He spent much of this season with Leicester's reserve team and only played one game in the English League Cup, scoring against Sheffield United.
The 25-year-old Nigeria worldwide moved from CSKA to Leicester for a club-record £18.2 million fee in 2016.
"We have a lot of players in his position and it is hard to give him more game time but we will see what happens at the end of the window".
His return to the club has been hailed in some quarters coming at a time when Super Eagles coach Gernot Rohr is expecting Nigerian players to be at their peak and play regularly ahead of the World Cup.