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The former Liverpool and Stoke player, 32, has been a free agent since leaving Wigan at the end of last season.
"Because we have had a game every three days we haven't had enough training to test his quality precisely," Luzon told BBC London 94.9.
"He has a lot of experience. We will see and take a decision."
Pennant joined the Latics in February on a short-term deal and scored three goals in 13 outings as Wigan were relegated from the Championship.
The former Arsenal, Birmingham, Real Zaragoza and FC Pune City man was offered a new contract but decided to leave the DW Stadium.
Luzon has signed seven players so far this summer and could still strengthen his squad before the transfer window closes on Tuesday.
"We have time and if we have the chance, financially, to bring quality players to the squad, we will do it," he said.
Charlton Athletic head coach Guy Luzon is considering offering a deal to winger Jermaine Pennant, who is currently training with the Addicks.

The NHS trust boards of Colchester Hospital and Ipswich Hospital will hold a public meeting outlining plans.
In a joint statement, the trusts said if the merger did not happen they would "struggle to maintain the range of patient services they currently provide".
The move comes after a review by staff, patients, clinical experts and health and local authority partners.
David White, chairman of both trusts, said: "By thinking differently and working together we can change the way we deliver care and provide excellent services that are vital for the future of the communities we serve.
"Many patients, staff and supporters have helped us to get to this stage in our partnership and I am immensely grateful for their time and effort."
A final decision will be taken by both boards around June 2018.
Two hospitals in the East of England are considering merging into one trust.

The 24-year-old, who will join Edinburgh Rugby in the summer, was injured in last month's Six Nations defeat by England at Twickenham.
Fellow Glasgow Warrior Josh Strauss is expected to be out for six weeks after injuring a kidney on Scotland duty.
Strauss will sign for Sale Sharks on a three-year contract in the summer.
Bennett had anterior cruciate ligament reconstruction surgery and is expected to take between nine to 12 months to return to full fitness.
Back-rower Strauss has been out since February but, following a review by his consultant, the 30-year-old has been told he requires six more weeks of non-contact work before being allowed to return to full training.
"We're disappointed that Mark's time at the club has come to an end in this way, and it also looks like Josh may not play for us again as he continues his graduated return to training," said Glasgow Warriors head coach Gregor Townsend, who is leaving to become Scotland coach.
"We wish both players all the best with their rehab and look forward to having them as part of our wider group for the remainder of the season."
Both players are due to attend Glasgow's Pro 12 game at Scotstoun a week on Friday, along with other squad members who are leaving in the summer, to mark their contribution to the club.

Scotland and Glasgow Warriors centre Mark Bennett faces up to 12 months on the sidelines after having cruciate ligament surgery.

