How is できれば used in this sentence?


申し訳ありません。 あなたのシャツが破れているのを それとなく お伝えできれば

I understand the sentence itself is "I thought I had to inform you about the
fact your shirt is torn"

But why きれば here used instead of just 伝えれば?




伝える becomes お伝えする in the humble form, which shows respect towards the object
person involved in the action, then, it further conjugates into お伝えできる in the
potential form, which stands for one’s ability, that is, “if I can tell you”.

