But the French free spirit has told his manager he would be crazy to abandon his defensive duties and attack with the quality of strikers at the Ibrox club.
McCoist was greatly impressed with the player during the Ibrox club's pre-season tours of the Highlands, England and Germany.
And he had no hesitation in handing the former Southend United and Ipswich Town player a two-year contract at the end of his successful trial.
However, the 26-year-old showed in his friendly appearances that he is not averse to taking risks and charging upfield on occasion.
As he prepared to make his first Gers appearance this weekend, though, he had calming words for his concerned coach.
"I am looking forward to playing in the league game this weekend," he said. "I will be very happy if I can be involved.
"It is down to the manager. I don't know if he is going to change his team around. We will see.
"It will be amazing to play a league game in front of an Ibrox stadium that is packed full of fans."
"Yes, I like to attack whenever I can and it is always nice to score some goals," he added. "That is my game.
"But my priority as a centre- back is always to defend and make sure the team I am playing for does not let in any goals.
"Anyway, the club clearly have a lot of good strikers so I do not think they will need me to go forward too much.
"I see the quality of the strikers in training and in every game. They are unbelievable. I think we are capable of scoring goals every time we play.
"Jon Daly, Lee McCulloch and Nicky Clark can all score goals for fun and I think we will continue to.
"We have some good, good players here already and I think the club will get back into the Premier League in this country quickly.
"The manager is very good with me as he is with all of the players. There are no problems in this team at Rangers. It's a very happy club."
Mohsni has been unable to play as a trialist in any league or cup games this season as he was last registered with a club outside Scotland.
So he is, along with Ricky Foster, Arnold Peralta and Stevie Smith, desperate to be involved in the SPFL League One game against Arbroath at Ibrox on Saturday.
All eight of the summer signings - Cammy Bell, Nicky Clark, Jon Daly and Nicky Law are the others - can be fielded now that the SFA signing ban has expired.
The availability of those players will make it far harder for the youngsters who have broken through in the last year to feature in the first team.
But Mohsni, who was the subject of a failed £150,000 bid from Barclays Premier League club West Ham United last year, still feels they will be involved.
He has been taken aback by the ability, fitness and maturity of the likes of Fraser Aird, Robbie Crawford, Kyle McAusland and Lewis Macleod.
And he thinks attacking midfielder Crawford in particular will continue to go from strength to strength in the weeks and months to come.
"All the young boys are very good players," he said. "Robbie Crawford has come through the academy and is a young player I like very much.
"He can be a legend if he keeps going the way he has been. He has two good feet.
"You can tell when you see a player which feet he can and can't play with. But he is equally comfortable with both feet.
"I think he just needs to pick up some confidence and play more games. When he does that he will be one of the club's great players."
After winning their first four games in emphatic fashion - they have scored 18 goals and conceded one - many people expect them to smash records this season.
It has even been suggested the full-time club can record a 100% league record this season.
Mohsni will, if selected, be doing his absolute utmost to ensure Rangers win every time they take to the field.
But the experienced defender envisages more demanding matches in the next nine months than those they have so far been involved in against Brechin, Stranraer, Airdrie and East Fife.
He said: "We have a lot of good players at the club. Lee McCulloch and the other players here are all excellent professionals.
"But it will be difficult for us in some games because some teams that we will play against will just be interested in defending and stopping us scoring.
"We will have to stay focused in every game and that is what I will be trying by best to do."