“I was so distressed at what they had done to Jonas, I just wanted to take my own life at the club’s door,” Ms Montore told the employment tribunal.
“I was going to leave a letter to say what a terrible way they had treated Jonas.
“He returns from his operation to have lost a testicle – from a hit on Newcastle’s pitch, he returns from that operation and they throw him out like a bad dog.”
Former Argentina midfielder Gutierrez, who was first diagnosed with testicular cancer in October 2013, alleges he was deliberately left out of the Magpies side so they would not trigger an automatic extension clause in his contract.
Newcastle contest the claims, with representatives including former managers Alan Pardew and John Carver set to give evidence during the tribunal in Birmingham.
‘I felt so desperate and low’
Ms Montore claimed she discussed committing suicide with one of Gutierrez’s lawyers, Colin Pomford, in January 2014 – soon after he had been told by manager Pardew that he was no longer needed by the club.
“I told Colin that I felt so desperate and low about the situation that I considered harming myself,” Ms Montore, who is also her son’s manager, told the tribunal on Wednesday.
“I asked Colin what the club would do if I were to commit suicide at the stadium, leaving a note explaining that this was due to the despair that I felt about the discrimination my son was facing by the club.
“Looking back, even expressing such thoughts looks extreme but I cannot deny that it happened and it brings back very clear memories.”
Under cross-examination from Newcastle’s barrister, Sean Jones QC, Ms Montore was asked to explain why she had not raised her concerns about discrimination directly with the Premier League club.
“You were going to raise the subject of discrimination in a suicide note?
“If you had genuinely thought that your son was being discriminated against – rather than just treated insensitively – you would have raised it formally wouldn’t you?” he said.
Ms Montore answered: “I think you are trying to dress a monkey with a silk dress and trying to pretend that it is a princess.”