The Croatian midfielder has been struggling with a leg injury.
“For me, I’m a little out of rhythm,” Modric told Spurs’ official website.
“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.
“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.”