Aguero wary of ex-Man City teammate Johnson at Sunderland
Aguero is wary of the trickster's threat.
"Adam is a great player and a teammate until recently. He knows us and we know him. It will be weird to have him as a rival, but we are all professionals and that won't affect our game - as usual, we'll go out for a win," he stressed to City's website.
"We beat them earlier in the season but no game is identical to another, and besides, the Premier League is nothing but tough matches."