A group of 24 home-based players have this week begun preparations for the two-legged final round fixtures on September 6 and 10.
"I think the players are cooperating very well," Osei told Kwesi Free Sports.
"The intensity of the training sessions is very high because we do not have a lot of time left before the match against Algeria.
"We have had to improvise a lot because the players were inactive due to the absence of a major competition.
"So, we are managing the training sessions very well but we can that they are responding and we are happy with what they did in the five days that they have been in camp.”
Ghana's team is expected to be beefed up with foreign-based players including captain Yaw Yeboah, Red Bull Salzburg midfielder Majeed Ashimeru and Levante striker Kwabena Owusu.
The Black Meteors will host the first leg before travelling for the return fixture.
The top three teams at the African championship will qualify for the Olympics.