According to the search results, the worst team in FIFA 23 can be subjective and depend on various factors such as the game mode, personal preferences, and statistics. However, some sources provide information on the worst teams in FIFA 23. For example, UCD AFC is statistically the worst team in FIFA 23 Career Mode. Ireland First Division side Longford Town Football Club is officially the second-worst team in FIFA, with a squad rating of 54 OVR. Additionally, some sources provide a list of the worst teams based on their overall rating, such as the worst 10 mens national teams, which include New Zealand, Iceland, and China. Therefore, the answer to the question "what is the worst team in FIFA 23?" can vary depending on the context and criteria used.