German power forward Theis is expected to earn a reserve roster spot with the Celtics following the three-for-one deal that brought Kyrie Irving to Boston. The 6’9” star from Brose Bramberg of the Euroleague has the potential to provide some much-needed rebounding and rim-protection for the Celtics. Theis was an important contributor on a team that won three consecutive national titles in Germany in addition to the 2017 German National Cup. In 2015-2016 and 2016-2017 he was a German BBL All-Star Starter and named the Defensive Player of the Year in 2016-17. He was also named the Best National Player in the BBL in 2015-2016. Theis will battle fellow international players Aron Baynes and Guerschon Yabusele for backup power forward minutes. The Irving trade does free up potential minutes for Theis. Expect Coach Brad Stevens to experiment with lineups throughout the season, which might results in both 15-minute games and DNPs for Theis.