I don't see any grounds to sue. First of all, it's not defamation unless something bad has been published to a third party. There is no indication of that here, and, even if there was, suspending you for a short period of time due to ostensible poor performance does not constitute defamation. Nor do I see it as actionable in any other way, with the possible exception of breach of contract. I say "possible exception" because I have no idea what were the terms of your written contract.
Good luck to you.
Michael S. Haber is a New York attorney. As such, his responses to posted inquiries, such as the one above, are limited to his understanding of law in the jurisdiction in which he practices and not to any other jurisdiction. In addition, no response to any posted inquiry should be deemed to constitute legal advice, nor to constitute the existence of an attorney/client or other contractual or fiduciary relationship, inasmuch as legal advice can only be provided in circumstances in which the attorney is able to ask questions of the person seeking legal advice and to thus gather appropriate information.
You cannot sue someone for defamation based on their opinion.
Mr. Pascale is licensed to practice law in the State of New York. The response herein is not legal advice and does not create an attorney/client relationship. The response is in the form of legal education and is intended to provide general information about the matter within the question. Oftentimes the question does not include significant and important facts and time-lines that, if known, could significantly change the reply and make it unsuitable. Mr. Pascale strongly advises the questioner to confer with an attorney in their state in order to insure proper advice is received.