The 24-year-old made 73 appearances for Brighton before joining Sunderland last summer.
He has played in 14 Premier League matches and one FA Cup game this season, scoring one goal and providing one assist.
An Africa Cup of Nations winner in 2023 and a starter in the final, where he was named man of the match, Adingra has 26 caps for the Elephants, but he was not selected for the recent AFCON in Morocco.
According to various sources close to the deal, Monaco paid 1 million euros (£850k) to activate the loan through to the end of the season, which includes a non-mandatory option to buy for 17 million euros.