MADRID, Aug 25 (Reuters) - Czech Republic international midfielder Jaroslav Plasil has joined Osasuna on a four-year contract from AS Monaco for 2.25 million euros ($3.05 million), the Primera Liga side said on Saturday. The 25-year-old will fill the gap left by Iranian international Javad Nekounam who is set to miss most of the season after tearing a knee ligament in a pre-season match. 'I've always wanted to play in the Spanish league and I think Osasuna is the sort of team where I can demonstrate my qualities,' Plasil told a news conference. 'It is a strong league with attacking football and I like that.' Osasuna open the season away to Athletic Bilbao on Sunday.