The 24-year-old, who had been out since January with an Achilles problem, featured during Monday's 6-0 friendly victory over Winterton Rangers.
"I felt pretty tired afterwards, but the first game back is always tough and especially after the injury," Aluko told the club's official website. "But it was good to be out there again. I enjoyed it and it was great to be back out there with the team.
"I'm concentrating fully on pre-season and it's all about getting back to full fitness."
Aluko and his teammates are currently in Portugal to continue their preparations ahead of the new Premier League campaign.