Eintracht Frankfurt are understood to be considering a move for the striker and he's also been linked with moves to the Premier League.
Record Sport exclusively revealed last week Eintracht Frankfurt were considering an offer having watched the 22-year-old on several occasions.
Morelos has made no secret of his desire to play in the English Premier League and has been linked with West Ham and Crystal Palace this summer.
The Colombian, who bagged 30 goals last season, netted a hat-trick in the Europa League win over St Joseph's last week as his season got under way.
But he's this week said goodbye to close friend Daniel Candeias as he left Ibrox to join Genclerbirligi.
Robertson admits anything is possible in the transfer market but is remaining cool over Morelos' future.
Asked if the club are confident they can keep the frontman, the managing director replied: "Listen, we'll see what happens.
"There's been no bids for Alfredo so far. He's started the season well with four goals in two games.
"He's playing with a smile on his face, so he looks happy to be here and we're delighted to have him."
Following the loss of Candeias, for which
Rangers are believed to have
scooped around £250,000, Robertson insists funds remain available to
Steven Gerrard should he want to make more signings.
The Rangers boss has been up front on his desire to bring Ryan Kent back from Liverpool, however any return for the winger would be another loan deal.
However, he's hinted he could also seek a direct replacement for Candeias.
And Robertson said: “It is down to the guys identifying who they might want to bring in and bringing that to the board but, absolutely, funds are available.
“I am not saying it will be this window or the next, but at some point there has to be transfer income built into the business model.
“If you look at clubs at our level in the European Club Association, the average percentage of revenue that comes from transfers is 28 per cent.
“Last year ours was about seven per cent.
“If we are to compete on a level playing field without relying on the investors and the board, that is a key part of the business model, as well as bringing players through the academy.”