The Ibrox side clinched the League One title with a 3-0 home win over Airdrieonians on Wednesday night, thanks to Lee McCulloch's first-half hat-trick which included two penalties, and preparations are already under way for next season where one more title win will see the Ibrox club back in the top flight.
However, the Govan club's financial position remains fraught and manager Ally McCoist does not yet know what money he will have, if any, to strengthen his squad in the summer.
Mohsni, though, believes there is enough quality at Ibrox at the moment to take them all the way to the Scottish Premiership.
The 26-year-old defender, who signed for Rangers after leaving Southend United last summer, said: "I don't know if the manager will add some players, we will see.
"Of course, the Championship will be tougher than this league, they have some good players.
"We played Falkirk in the cup and they were quite good. So I think it will be tougher but I am quite confident we can win that league too.
"I like this team. This team is fantastic. Look at the job we did.
"If he adds some players, if there are players who can help us it will be good, if he doesn't add players it will be good too.
"With the same team we can play in the Scottish Premier League.
"But I am not the manager."
Rangers have come in for criticism this season for their performances, none more so than following the 1-1 draw against Albion Rovers in the William Hill Scottish Cup quarter-final tie at Ibrox on Sunday.
However, Mohsni believes the Light Blues can progress through the replay at New Douglas Park on Monday to meet Dundee United in the semi-final at Ibrox.
"They [Rovers] defended so deep, it was hard to find any space," said the Paris-born defender.
"I was centre back but I was in the middle of the park.
"But they did very well, but they just had one chance and they scored. So well done to them. Now we have another game on Monday and I am quite confident."
Meanwhile, the Rangers fans' group, The Union of Fans, will distribute 30,000 blue cards ahead of the visit of Dunfermline on Saturday for a display in support of former director Dave King who is looking to affect boardroom change at the Govan club.
The Glasgow-born businessman, who put £20m into the club under a previous regime, flew over from his South Africa base earlier in the week to talk to the club's investors in London with regards a new share issue and will meet with the Rangers fans on Friday.
Light Blues' fans will be asked to welcome King's involvement by displaying the cards on the 18th and 72nd minutes - a reference to the club's foundation in 1872.
Union of Fans spokesman Chris Graham said: "The club clearly needs investment and Dave King has publicly stated his willingness to provide it.
"We hope that fans will take the opportunity to show their support for someone with a track record of supporting Rangers both personally and financially.
"Hopefully the board will realise the strength of feeling on this issue and adopt a less adversarial approach in their future dealings with Dave King.
"Fans should not underestimate the power they have to push for positive change at another critical time for the club.
"The cards will be handed out by volunteers around Ibrox before the game. So if people want to take part we would ask them to seek out a card prior to the game."