Manchester United are closely monitoring the progress of Eintracht Frankfurt's 22-year-old German-American left-back, Nathaniel Brown, according to sources close to the agents industry who informed CaughtOffside. The same sources indicate that Manchester City, Newcastle United, Aston Villa, and Arsenal are also tracking the player. It is believed that both Manchester City and Arsenal are considering the possibility of opening talks soon to bolster their defensive options on the left side. Brown's contract with the Bundesliga club runs until 2030, and the potential absence of a release clause could place Frankfurt in a strong negotiating position. The player currently has a market value of €22 million, according to Transfermarkt.