Bayer Leverkusen and fellow Bundesliga club Borussia Dortmund are monitoring Emmanuel Fernandez, a 23-year-old defender. The player was signed from Peterborough in the summer for £3.5 million, and it is expected that any potential offer for him will be significantly higher than that fee. His former club Peterborough is also due a substantial sell-on fee. Rangers are keen to retain their key players.