English language exemption for skilled worker visa

I need urgent assistance on the language requirements. I am applying from outside UK for skilled worker visa in construction sector as bricklayer. I have been told that if my employer who will issue COS mentions that he has assesed my language and fulfills the requirement then there will be no need to submit IELTS at the time visa application. Can someone assist me on this?

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There is a requirement to demonstrate a verifiable level of English. A sponsor can not self assess your level.

Level of English
You must prove you can read, write, speak and understand English to at least level B1 on the Common European Framework of Reference for Languages (CEFR) scale.

You can prove your knowledge of English by:

passing a Secure English Language Test (SELT) from an approved provider
having a GCSE, A level, Scottish National Qualification level 4 or 5, Scottish Higher or Advanced Higher in English, gained through study at a UK school that you began when you were under 18
having a degree-level academic qualification that was taught in English - if you studied abroad, you’ll need to apply through Ecctis (formerly UK NARIC) for confirmation that your qualification is equivalent to a UK bachelor’s degree, master’s degree or PhD