Explaining 非正式报价

I want to provide a neutral and brief explanation of '非正式报价.' This term refers to exploratory communication with agents, indicating it's not a binding bid between clubs. It's common in transfers, but it could violate rules against tapping up players if done without permission. Additionally, I think about including a quick analysis regarding Rodrygo Goes and Liverpool's situation with Salah, keeping it generic and not asserting any conclusions. I could present options for what to do next.