His place at the club was in threat due to its decision to conduct trials for two defensive midfielders, Nigerian David Udoh and Sudanese Sharaf Eldin Shiboub.
The midfielders could not impress the outfit's coaches, a situation that handed Lwanga a second chance.
Lwanga suffered an injury when Simba SC took part in the 2021/22 CAF Champions League Second Preliminary Round's return leg tie against Botswana's Jwaneng Galaxy FC which took place at Benjamin Mkapa Stadium in Dar es Salaam last year.
Jwaneng Galaxy FC thrashed Simba SC 3-1 to make it to the Group Stage through an away goals' rule as the two clubs were locked to 3-3 draw on aggregate.
Lwanga, who joined Simba SC in December 2020, now recovering from a long-term injury, is expected to turn into a key player at the side.
Ahmed Ally, Simba SC's Head of Information and Communication Department, said: "We were ready to find a replacement for Lwanga but the doctor has assured us he will be fine by the end of this month.''
Lwanga, who as well turns out for Uganda's senior national football team 'Cranes’, had been released by Egyptian outfit Tanta SC before joining Simba due to his former outfit's failure to pay his salary.
The Uganda player of the year in 2021 joined Tanta SC from Uganda Premier League champions, Vipers SC, at the start of the 2019/20 season.
Before becoming popular in Tanzania, the midfielder had registered just 11 appearances during his short stint at Tanta SC.
Lwanga was Simba SC hero in the previous season's Federation Cup final against Yanga, which took place in Kigoma, after netting the only goal for his side.
Ally said Simba SC striker Kibu Dennis is fine and did not suffer an injury during the outfit's Premier League match against Mbeya City FC, which ended with Simba SC conceding a 1-0 defeat.
Ahmed said the striker is fine and was, on Wednesday, part of the squad's training along with his teammates in preparation fr a Premier League match against Mtibwa Sugar which will be played at Manungu Stadium in Morogoro on Saturday.