Former Rangers star Ronald de Boer has explained what could help Gers striker Alfredo Morelos, if he wants to reach the highest level.

Morelos bagged a second half brace against St Johnstone on Sunday in the Scottish Premiership as Rangers came from behind to secure maximum points at McDiarmid Park.

The result meant that Steven Gerrard’s men are still within touching distance of rivals Celtic, albeit playing an extra game, in the race for the league title.

Despite his match-winning performance on Sunday, Morelos picked up his 10th yellow card in all competitions and the striker has come in for criticism due to his disciplinary issues in recent times.

De Boer, who won the domestic treble with Rangers in 2003, knows the striker needs to work on keeping his discipline.

The former Ger admitted that Morelos should keep his temperament in check and insisted that the Colombian will eventually learn to do it with experience.

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“This boy has the temperament of a young man”, De Boer was quoted as saying by the Herald.

“He just has to control it. He has to realise that he is disadvantaging his team when he gets a red card.

“When you buy a new car you want to drive it fast. As time goes by you think: ‘What’s the point? I am still going to get from A to B’. He will learn.”

However, De Boer also insists that Morelos cannot lose his aggression, which is a key reason behind his good form.

“At the same time, Morelos can’t lose that aggression, he has to keep that.

"To be honest, it is probably one of the reasons he is such a good striker”, he continued.

“But if he wants to get to the highest level he has to control his temperament and make sure it isn’t a negative influence.”

De Boer is set to represent a Rest of the World side in the Star Sixes tournament scheduled to be held in Glasgow next month.