O'Neill has vowed to "drive forward together" and "not rest on past success", so what could a full season with the Northern Irishman at the helm look like? As well as strengthening the squad, Celtic will be hoping to welcome back key duo Cameron Carter-Vickers (left) and Jota (right) from long-term injury [SNS]Will O'Neill flex European pedigree? AdvertisementAdvertisement AdvertisementHowever, the tracksuit-wearing veteran will want to be doing his dugout air jumps in Uefa's premier club competition this season. Plus, with Maeda gone and Arne Engels linked with a move away, the lure of top-level European football can prove crucial in persuading star players to stay. A two-time European Cup winner with Nottingham Forest, his record as a manager in the competition stands at six wins from 18 matches.