The 22-year-old Cameroon international became our fourth signing of the January transfer window, making the Teesside switch on deadline day.

Boro head coach Jonathan Woodgate said: “We’re delighted to bring Harold in to the club. He’s a player we’ve been keeping an eye on and it’s a real coup that we’ve been able to bring him here.

“He’s a unit of a defender, a real big, strong lad, and he’s a quality player. He’s still young, but he has plenty of experience, having played in the top division in France, in the Europa League, and also for Cameroon.

"He’ll be a very important addition to our squad and will really increase the competition we have for places."

Moukoudi began his career with Le Havre where he made 63 appearances and scored six goals for the Normandy-based side, and was a regular feature at the back for them.

The former French Youth international signed for Saint Etienne last summer, and played at the Riverside against Boro in pre-season in a 1-1 draw.

Moukoudi has played 16 times for Saint Etienne this season, and has featured in their Europa League campaign.