Jarrett is on loan from Brighton, but his loan had expired after Saturday's defeat at home to Rotherham, but Brighton have agreed to let him stay at the County Ground for another 4 weeks.
Onoura said: "We didn't want to dismiss Albert as I don't think we have seen the best of him. I felt it was prudent to give us the chance to see more of him. He is a quiet lad, but he has seen this as an opportunity to impress. The start of his career was abit stop start, which effectively ruled him out of several games, so hopefully he can get on with his career here now."