Tottenham midfielder Luka Modric has admitted to being below par so far this season.[LNB] But the Croatia midfielder has vowed to be back to his best by the end of the month, blaming a spell on the sidelines with a leg injury for his lack of "rhythm".[LNB]Modric, who is currently on international duty, told his club's official website: "For me, I'm a little out of rhythm.[LNB]"I've had a couple of injuries this season and I'm not yet back into my rhythm but, in a couple of games, I'll settle down and play better.[LNB]"I just need to be fitter. It's been hard for me because I've had a couple of injuries but in a couple of matches I'll be back into full shape."[LNB]Modric, 25, has been overshadowed in recent weeks by new team-mate Rafael van der Vaart, who has established himself as Spurs' new talisman since signing from Real Madrid.[LNB]Modric is delighted by the impact made by the £8million man, adding: "Rafa is an exceptional player and he's showed that since he came to the club.[LNB]"He's a great signing. He's played at great clubs: Ajax, Hamburg, Real Madrid, and I think he can give more quality to the team."[LNB]Manager Harry Redknapp revealed after Van der Vaart's arrival that he felt the Holland midfielder and Modric would complement each other perfectly.[LNB]Modric agreed, saying: "It's not hard to play well with that kind of player and I'm happy he's here with us."