Ibrox club Glasgow Rangers striker Alfredo Morelos was sent off last week.
Morelos is one of the best strikers in the Scottish Premiership and is a key figure in Steven Gerrard’s Rangers team.
The 22-year-old Colombia international has made 22 starts and one substitute appearance in the Scottish Premiership for the Gers so far this season, scoring 15 goals in the process, according to WhoScored.
However, the youngster has been sent off on more occasions than anyone at Rangers would have liked to, including against Aberdeen in the Scottish Premiership last week.
Former Rangers striker Boyd, who is now at Scottish Premiership rivals Kilmarnock, believes that Morelos is not going to change.
Boyd wrote in The Scottish Sun: “Rangers value Morelos highly and everyone can see why from a football point of view. But clubs want the complete package when they’re being asked to pay the sort of money Rangers will be looking for.
“And I’m sorry, Morelos just isn’t that package. He’s flawed and it’s going to hold him back from making the type of move in his career that his talent deserves.”
Boyd added: “We all make mistakes but there comes a point where you need to start learning from them. With Morelos, I just don’t believe he ever will.”
Rangers are challenging for the Scottish Premiership title this season and are giving their bitter Old Firm rivals Celtic a run for their money.
Gerrard’s side are second in the league table at the moment with 51 points from 25 matches, six points behind leaders Celtic.
Andy Walker surprised
Meanwhile, former Celtic striker Andy Walker has admitted his surprise that Rangers manager Steven Gerrard is calling for action on Alan Power.
The Scottish Sun has quoted Rangers manager Gerrard as saying that he wants to see if Power faces retrospective action for his challenge on Ryan Jack during the Scottish Cup tie at the weekend.
If Power faces a ban, then he will be out of Kilmarnock’s match against Celtic this coming weekend.
The Scottish Sun quotes Walker as saying: “I have no idea why Steven Gerrard wants Alan Power to be cited for that as Kilmarnock’s next game is against Celtic.
“Why would you want one of the more important, more influencial players, why would you want him to miss a game against your rivals?”