Tano has been absent since coming at half-time against West Ham, but has been troubled by the injury since the home game against Southampton.
He is now back in light training but will not risk a playing return until he is confident the injury has fully cleared up.
"I'm okay," he reported. "It is the abductor muscle in the groin and I am having treatment and training a little bit.
"I need to get it 100 per cent. I don't want to come back and have a problem again, I want to be able to everything and train 100 per cent pain-free.
"It is a day by day thing really, it improves every day. I did some training this morning and it felt, overall, okay.
"Obviously I need to keep training, when I sprint I feel it a little bit and when I use the inside of my foot to kick the ball I feel it.
"I need to be careful and make sure it is perfect before I step up. It will take a little bit of time, but what can you do?"
Mauricio Taricco is optimistic that his recovery from a groin injury is progressing well.