Pinto admits the personal touch helped to close the striker's signing in Roma's favour.
He told inews: "Sometimes only the shirt number makes the difference. When we signed Abraham he was close to signing for other clubs, we made sure we had a shirt with his name and the number he would wear, the first time we met."
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On his work with agents, Pinto added: "I try to be methodical, I'm not the type who calls everyone saying he's interested but works on a lot of agreements together.
"An agent once told me that I'm the only sporting director who says straight away if I'm not interested."