The 34-year-old defender, who has been the linchpin of the Madrid defence for the past decade, partially tore a right knee ligament and had to leave the action midway through the second half of his side's 4-1 victory against Real Betis Balompié at the Santiago Bernabéu on Satuday.
The man who lifted the European Champion Clubs' Cup last season following Madrid's 2-1 final victory against Bayer 04 Leverkusen, Hierro has featured in six of his side's eight games this time around. However, the centre-back will definitely miss the two matches against BV Borussia Dortmund and, almost certainly, AC Milan's visit to the Spanish capital on 12 March.
If Hierro recovers quicker than expected, he could feature in the final Group C game away to FC Lokomotiv Moskva on 18 March. Madrid's bid to reach the last eight is likely to go to the wire as they have collected just a point from their opening two fixtures, a loss to Milan and home draw against the Russian team.
Hierro will not miss any of Spain's qualifying matches for UEFA EURO 2004™ after retiring from international duty following last summer's FIFA World Cup, his fourth. The player has enjoyed a trophy-laden spell at the Bernabéu after joining Madrid from Real Valladolid in 1989, his honours including three Champions League titles, four Spanish first division titles and one Copa del Rey.
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