Celtic are stepping up their pursuit of Chivas USA winger Sacha Kljestan. The Parkhead club are keen to land the highly-rated attacking midfielder, says the Sunday Mail.

But the 23-year-old is being tracked by Monaco, Heerenveen, FC Twente, Leverkusen, Schalke and Wolfsburg.

Greeks Olympiakos and Russian giants Zenit St Petersburg are also thought to be monitoring Kljestan who has 11 caps.