Gul, 29, began the last phase of his rehabilitation program at the national cricket academy on Friday and said he was missing playing for the Pakistan team.
"It has been a frustrating time for me and I miss being with the Pakistan team. But right now I am just concentrating on regaining full fitness," he said.
Gul, who is the most seasoned pacer in the present Pakistan team with 163 Test, 161 ODI and 74 T20 international wickets, underwent a knee surgery in May in Australia after complaining of severe pain and swelling in his right knee during the tour to South Africa early in the year.
"Right now we have just started putting pressure on both his knees so it remains to be seen how he responds but his rehabilitation program has gone well so far. We will not rush things where his fitness is concerned," Saleem said.
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The PCB decided to send Gul to Melbourne for the surgery after MRIs confirmed tear of the posterior horn of medial meniscus with patchy bone bruising on his right knee.
Gul said he hoped after the surgery the knee would not trouble him again and allow him to bowl at full pace.