Playmaker Haroun, 25, a Belgium international, has been training at Rockliffe since last week, and travelled to Leeds and Barnsley to see his new side pick up six points while he awaited international clearance from FIFA.
Now, the player signed on a free transfer from Jupiler Pro League outfit Germinal Beerschot is available for selection and will play some part in Boro's game against Birmingham City tomorrow.
The 6ft 2ins midfielder has long harboured a desire to play in England, and hopes to show what he is capable of if selected by Tony Mowbray.
Haroun said: "It's good now I have finally received clearance and I can be in the squad. It's been a long time but I'm happy to be here now.
"It's been frustrating, I wanted to play sooner, but I'm happy that the team have been winning and have taken six points from six.
"The facilities, the history, the players we have here, the staff who have given me the opportunity to come here, it's all very good, so I'm pleased to be here."
Haroun, who has made six appearances for his country, is a midfielder who likes to get forward, and is confident that he can slot into Mowbray's plans quite quickly.
He said: "They know I like to play football, the team are always playing and I'm sure I can show my qualities and show what I can bring to the team.
"Birmingham is very soon, it's up to the manager, the games are going to come and the more I play the better I will be.
"They're going to see it on the field without me talking too much, my physical qualities, the goals I bring, hopefully they will see that on the field."
Haroun's first experience of his new employers came in a steamy encounter at Elland Road, where Boro won 1-0 in an ill-tempered clash which saw three players sent off. Rather than alienate him, Haroun admitted it was everything he expected from a Football League game.
He said: "It was a typical English game, - red cards, fouls, a last minute goal, it's the type of football I like. I'd rather have come here than go somewhere else for the money.
"I think the staff, the team, make me feel very welcome and I already feel very good here.
"I'm not making any targets, to play as many games as I can, to bring something to the team and to help the team reach the highest position. If I get goals, that's fine but the team is more important."
Source: Northern Echo
Source: Northern Echo