You are looking in every line of the team," Martinez told the club's official website. "In goal we are strong. Joel Robles showed this season that he is a keeper with a lot of potential and we are privileged to have Tim Howard.
"So it is about adding a player per line and making sure they are specific profiles and suit what the team requires. That makes sure the work that we have over the last six or seven months since December and January is paying off now in this window and we are in a position to make bringing in those players a reality."