He claims that Bowyer will prove to be a valuable addition to the squad and that he isn’t concerned by press criticism of his decision.
"I am running a football club and we went ahead with the signing on the promise that Bowyer will be a good lad and will behave properly, and in the football sense he will be an excellent signing for us," Sir Bobby told the Evening Chronicle.
"Newcastle United can only improve by signing good players and Lee Bowyer is a good player."
He continued: "I knew the criticism would keep on coming. And I knew it would be directed at me.
"But you don't have to worry about me. I have a broad back and I can take the criticism. I won't argue with the people who are having a go at me.
"They have a point and they have to write what they feel. It's their job to write articles, but I am a football manager and their roles and my role are completely different. They do not have to get results for Newcastle United, but I do.
"I understand their point of view completely and utterly, but we will not be replying to them. We will take any criticism on the chin.
"We expected the criticism and we took this into consideration when we took the decision to sign Bowyer."