Rangers manager Steven Gerrard has admitted striker Alfredo Morelos' future at the club is uncertain.
The 25-year-old, who is still to return to Ibrox after Copa America duty with Colombia this summer, has been heavily linked with a move to Porto.
Morelos has two years left on his deal having scored 94 goals in four seasons with the Scottish champions.
Asked if he is confident Morelos will stay, Gerrard told Sky Sports: "I don't know. I can't answer that question."
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He added: "I've read a lot of stuff around Alfredo. I know where it's coming from, but I don't know what's going to happen with him."
Morelos - a £1m signing from HJK Helsinki - netted 17 times in all competitions last season as Rangers secured their first top-flight title in 10 years.
Having attracted interest from China early in his Rangers career, and been targeted by Lille last summer, the speculation over Morelos' future has become "tiresome" for Gerrard.
"I get asked this question every window because you read more about Alfredo in terms of who he is linked with or where he's possibly going rather than talk about what he does on the pitch," he added.
"I'm not frustrated, I'm very happy. We're just off the back of a fantastic season and I'm so excited for the new season."
Gerrard, meanwhile, is confident of securing Connor Goldson on a new contract as talks continue with the centre-back.
Goldson, 28, was a Premiership ever-present for Rangers last season and is into the final year of his deal.
"Hopefully sooner rather than later we can get him tied down because he is very important to the club," Gerrard added. "He is robust, a leader, a top player and as a manager they are the types of player you want to rely on."