When referring to a work or sports environment, there are a variety of synonyms that can be used for the term "current teammate." Some common alternatives include current coworker, current colleague, current teammate, or current squad member. Each of these terms is commonly used to refer to someone who is currently working or playing alongside you and is a part of the same team. If you are looking for a more informal or playful alternative, you could also consider using terms like "buddy," "pal," or "mate," which are all commonly used in friendly or casual environments. Ultimately, the term you choose will depend on the context and tone of your communication.