Manchester United manager Sir Alex Ferguson watched Celtic midfielder Victor Wanyama in action last night.
The Red Devils boss was in attendance for Celtic's 4-0 victory over Dundee United as the Kenyan midfielder put in the kind of impressive display, capped with a goal, that has been attracting interest from the Premier League.
Manchester United are understood to be one of the sides keeping close tabs on the 21-year-old and Wanyama's performance is unlikely to have altered that.
The imposing midfielder has been integral to Celtic's progress in the Champions League this season, most notably with his headed goal in the famous victory over Barcelona at Parkhead last year.
The Independent reported earlier this week that Arsenal are also interested in Wanyama as they look to address the imbalance in their midfield.
Celtic will not want to part with Wanyama before their Champions League last-16 tie against Juventus next month and will be seeking in the region of £10m should he be allowed to leave.
While the fee is high for the former Beerschot AC player, it's understood his wages would be comparatively low.