Rangers transfer: Danny Ruhl talks about the qualities of Ryan Naderi

“Not just in terms of the details but also how we handle external matters. I’m very happy with what we’ve done so far.

“We have reduced the numbers but increased the quality in the team.”

Regarding Naderi, Rühl said of the German, who joined from Hansa Rostock: “I’m very happy that we were able to sign him, so late. It’s been a long process with him. He showed straight away that he wanted to come and it was very clear.”

“We’ve been following him in the last few weeks and months. He’s scored, he’s made some assists, he’s strong, he can run. Good header, good physicality, good pressing player – a lot of things we need up front. He needs some minutes to adapt to the new league.”

“He has regularly played a lot of minutes in the last two weeks.”

Rolle also likened Naderi to Germany strikers Fredi Bobic and Nick Voltimadi, the latter of whom retired from Newcastle United and Bobic in 2006.

Scottish Premiership leaders Heart of Midlothian could move nine points clear of Celtic and Rangers if they beat St Mirren on Tuesday evening (20:00 GMT). Rangers host Kilmarnock on Wednesday (19:45), when Celtic visit Aberdeen (20:00).

“We have at least two games against them,” Ruhl said of the “consistent” Hearts.

“We can win a lot of games until the end of the season. I cannot guarantee you that we will win 14 games because there is still an opponent.

“I am absolutely convinced that this group has everything in place to move forward with these final steps.”