Is this source credible to add that Erik Selvig is an Avengers: Endgame character? Hs actor explained that he has five films on his contract (Thor, The Avengers, Thor: The Dark World, Avengers: Age of Ultron)? He did not appear in Thor: Ragnarok nor Avengers: Infinity War.
Despite how likely it is, it was never confirmed by any sources. Skarsgård did say he has 5 films on his contract, but him saying he's likely to be in Infinity War (which didn't happen) isn't confirming that he was, or will be in Endgame. So, for now, no.