Celtic are reportedly closing in on the signing of Paderborn defender Mika Baur, with terms said to have been agreed on a deal worth around £4m, according to the BBC.
The Hoops are also believed to be moving in the opposite direction on another front, with forward Daizen Maeda reportedly set to complete a transfer to Ipswich Town as Celtic look to trim their squad ahead of the new campaign.
Meanwhile, north of the border, Rangers' interest in Vanja Dragojević appears to be edging towards completion, with the switch understood to be unofficially confirmed despite no formal announcement from either club.
None of the moves have yet been made official, and as ever with transfer gossip at this stage of the window, the figures and finer details could still shift before any deals are signed off. Celtic fans will be watching closely to see whether Baur's arrival strengthens their defensive options while Maeda's departure reshapes their attacking plans for the season ahead.