Koloveros spent the 2021-2022 season on loan to Greek Basket League club Ionikos Nikaias. In 20 league games with Ionikos, he averaged 9.6 points, 2.5 rebounds, 2.4 assists and 1.4 steals, playing around 25 minutes per contest.
Koloveros started the 2022-2023 season with Olympiacos, but was loaned to Lavrio on December 8, 2022, in order to replace the injured Alexandros Nikolaidis. In 13 league games with Lavrio, he averaged 7.1 points, 1.5 rebounds and 2 assists, playing around 21 minutes per contest. He also earlier appeared in 2 league games with Olympiacos.
On July 31, 2023, Koloveros was loaned once more to Kolossos Rodou. On May 25, 2024, he renewed his contract with the club.