The January signing from Arsenal's Bees debut was cut short by a dead leg during Saturday's 1-1 draw at Shrewsbury.
Boss Mark Warburton also received some good news on the injury front after Adam Forshaw came on to replace Yennaris following a month out, while defender Harlee Dean also returned from his recent lay-off.
"Harlee came through 90 minutes," said Warburton.
"I thought about playing him for 65 or 70 but Nico got a slight dead leg. It caused him problems so we had to make the change.
"Adam came on and looked good and Harlee got through 90 minutes. We are pleased with that.
"Nico did very well. He adapted well, kept it simple, looked after the ball and had a good debut."
- Adam Forshaw
- Harlee Dean