With the White Hart Lane club missing out on Champions League football for 2012-13, the Premier League side are expected to struggle to hold onto their star playmaker.
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"He's playing very well; Barcelona have someone watching him," Jimenez told reporters.
"He was present at Croatia's game against Italy, but I can not say who he is."
Manchester United are also believed to be interested in signing Modric this summer, while Chelsea pursued the Spurs man in the summer of 2011.
Spurs, meanwhile, are still expected to sign Ajax defender Jan Vertonghen despite Harry Redknapp's departure this week.
Goal.com understands the club's pursuit of the player will continue and will not be affected by the change in management at White Hart Lane.