The former WBO super featherweight and lightweight champion is stepping up to light-welterweight after losing two fights in a row.
The 31-year-old Coatbridge fighter is set to make his comeback from defeat against Dejan Zlaticanin when he takes to the ring in Leeds on October 4, and Morrison believes he will return a better boxer with the extra weight.
Burns was unconvincing in the final two successful defences of his nine-fight stretch as a world champion.
He recovered from a broken jaw against Raymundo Beltran but lost his title to classy American Terence Crawford before his shock defeat to Zlaticanin.
Morrison said: "Ricky was finding it increasingly harder to make the weight.
"He was virtually eating nothing before the weigh in and I think that had a lot to do with his last three performances."
Morrison added: "He is just looking forward to October and fighting at the new weight. We're planning on him winning a third world title."