Chris Pratt, Star-Lord in Guardians of the Galaxy and Avengers: Infinity War, recently confirmed he will be back for Guardians Vol. 3. It’s still unclear when in the MCU the third installment of Guardians will take place. However, the internet keeps suggesting the film will act as a prequel to Infitiy War taking place sometime between Guardians Vol. 2 and the former. When asked about appearing in Avengers 4, Pratt had this to say.
“I’m slated to film Guardians of the Galaxy Vol. 3 in January, so we don’t know yet, time-wise, where that lines up. I’m hoping it’s not the last time you’ll see me (in the Marvel Cinematic Universe), but I can’t be sure.”