Martin O’Neill was last night still battling to add another name to his squad after landing six players in a frantic 24 hours.On an extraordinary day off the field for the champions, former England goalkeeper Sam Johnstone joined on a season-long loan from Wolverhampton Wanderers.Chelsea striker Shim Mheuka was next to be confirmed in a similar arrangement, the 18-year-old thought to be a rising star at Stamford Bridge.Later on, Mheuka’s team-mate Landon Emenalo also arrived on a one-year loan to provide cover at left-back for Kieran Tierney.Then, after last night’s routine win over Aberdeen, Celtic confirmed a four-year deal for Joel van den Berg from PSV Eindhoven and a season’s loan for Feyenoord’s Swiss right-back Jordan Lotomba.Midfielder Oliver Sorensen had agreed a one-year loan from Parma on Tuesday. Celtic new boys Oliver Sorensen and Shim Mheuka came off the bench in win over AberdeenWith the Scottish transfer window closing at 5pm today, Daily Mail Sport understands that O’Neill is still hopeful of signing Gvidas Gineitis of Torino.Speaking immediately after disposing of the Dons, O’Neill hinted that he’d still sign players even if they couldn’t feature in the Europa League.‘Honestly, I am pleased that we have done what we have because there’s quite a few who have left the football club,’ he said.‘Reo’s (Hatate) gone and Johnny Kenny has gone. I wish them all the best and so we need people in.‘Even if they miss the European deadline, if there is a possibility of getting someone else in, I would definitely want to do that if we can.‘When I came in in January, I ended up promising one of the players that we brought in to the squad (he could play in Europe) and then I had to tell him (he couldn’t be registered) and he nearly took the bus home.‘I had to tell him that I hadn’t realised, because there’s only X number you can do, you’ve got your Scottish contingent, then you’ve got a few changes that you can make. Celtic manager Martin O’Neill cheered on his team before signing off more new arrivals‘Honestly, I just didn’t know that. And really sometimes, the people who are signed to the football club, who belong to the football club permanently, maybe they deserve first shot.’Both Sorensen and Mheuka made their debuts from the bench against the Dons. Johnstone was part of the match-day squad while Van den Berg was pictured in his club tracksuit.‘I’m very pleased that they’re in the door,’ added O’Neill. ‘I think that they’ll definitely add something to us. I think the blooding of these players will be really great for them.‘Hopefully, it turns out in our favour. We’re looking at another 15. They’re actually in the turnstile, some of them.’Asked if he was confident that the squad would be strong enough to compete on all fronts at the close of business, O’Neill added: ‘One has to be confident, one has to be.’The Celtic boss was delighted with the way his side made short work of Aberdeen with first-half goals from Camilo Duran, Benjamin Nygren and Yang Hyun-jun.‘Camilo set the tone for us,’ he said. ‘I think perhaps maybe all season he’s done that. He’s a really class player.‘It seemed pretty comfortable at the end and we played some really good stuff as well too, so I’m delighted with that.’ Celtic’s in-form front man Camilo Duran celebrates his early opener against AberdeenAberdeen boss Stephen Robinson explained his thinking behind making four substitutions at half-time.‘Furious is not the word,’ he stressed. ‘Disappointed, because I see different boys on the training pitch and it’s getting that belief to play for Aberdeen and getting that belief to play a certain way and be brave on the ball.‘You’ve seen it in the second half, taking the ball in areas, but it’s too late then. It’s too late, the game’s over then.‘So, it’s to get them to do that. Shouting and screaming at people and criticising them isn’t going to change that. They’re a group of boys, some of them not used to Scottish football. There’s been a lot of change and it will take time.’