In-form Gareth was clearly in pain as he limped off after just 20 minutes at Newcastle on Monday but the youngster might only be out for up to 10 days.
"We've scanned the injury several times and nothing is broken," said Martin at Spurs Lodge on Wednesday afternoon. "There is significant bruising, it is still painful and we'll know more once the bruising has gone down.
"I feel he will be fine though and will only be out for a week to 10 days."
Ledley, meanwhile, looks set to return to full training next week. "He's had no reaction to football drills and hopefully he'll be with us next week. From there, it could take another three to four weeks."
Radek Cerny will continue in goal with Paul Robinson out with his calf injury. "Paul is out for Thursday, a big doubt for Blackburn on Sunday but could be back for Blackpool in the Carling Cup next week," added Martin.
"Young-Pyo Lee is also a doubt with a shoulder problem but he could still be involved."
Ricardo Rocha (ankle) and Benoit Assou-Ekotto (knee) remain out.
Ben Alnwick has been recalled from his loan spell at Luton Town.
Martin Jol can report positive news on Gareth Bale and Ledley King.