The Colombian finally arrived in Merseyside on Friday afternoon after a deal was struck between the two sides for his £37.5million transfer - a deal that could rise to £50million.
Gomes said: “It was not a good deal. Porto don't find themselves in a comfortable financial situation, but the truth is that Liverpool got Diaz for a bargain price."
Julio Comesana, who had Diaz under his stewardship at Colombian side Junior, told the Telegraph: “He's a very humble boy.
“I've never seen him fighting others, being disrespectful or drawing attention for what he does on social media. He's a protagonist where he needs to be and that is on the pitch.
“I have no doubt whatsoever that Diaz will be able to settle quickly in Liverpool because that's the story of his life. He's an adapter."
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