Swopshire averaged 3.3 points and 2.8 rebounds as a senior last season after sitting out the previous year because of a groin injury that required surgery. He is graduating this spring and is transferring because Louisville does not have an open scholarship available. He will be eligible to play next season.
A 7-foot center from Romania, Olah helped lead Traders Point Christian Academy to two consecutive Indiana Christian Schools state championships. He averaged 18.5 points, 13.1 rebounds and 4.6 blocks as a senior. Olah also led Romania in scoring, blocked shots and rebounding at the 2011 FIBA U18 European Championship in Bulgaria.
Northwestern announced the additions Wednesday.