Neil Lennon hailed the contribution of his fringe players as they helped his side move top of the Scottish Premier League with a comfortable 4-2 win over Inverness Caledonian Thistle. With a long injury list and one eye on Wednesday's crucial Champions League qualifier, Lennon fielded a makeshift Celtic side at the Caledonian Stadium with teenagers Tony Watt and Filip Twardzik handed their first competitive starts as the Hoops made six changes. Watt, who scored a double on his debut as a substitute against Motherwell last season, impressed with goals in either half to grab a double. Victor Wanyama had headed Celtic into a third-minute lead before Watt doubled the advantage in the 25th minute, breaking away to clip the ball over keeper Ryan Esson. Captain Charlie Mulgrew made it 3-0 in the 48th minute with a neat finish from a well-worked free kick before Watt got his double with a rifled shot in the 64th minute. Inverness rallied in the final 10 minutes, with Ross Draper grabbing a double but it was mere consolation for the hosts. The Hoops now take on Swedish champions Helsingborg at Parkhead on Wednesday as they bid to make the group stages of the Champions League for the first time since 2008. Celtic hold a 2-0 advantage from the first leg and Lennon says the performance of his fringe players has given him some food for thought going into the game. "The squad is taking good shape now. I thought Watt had a sensational game and Twardzik was excellent as well," the Celtic manager said. "They've done themselves no harm at all with that performance. The senior boys all contributed brilliantly as well." Lennon was without several first team players as they struggled with minor knocks but the Hoops boss was confident of welcoming some back for the vital Champions League tie. "Wednesday is such a huge game in the context of our season but hopefully the players who played in the first leg, the likes of Kris Commons, Georgios Samaras, Scott Brown and Thomas Rogne, will all play," Lennon said. "But Beram Kayal and Joe Ledley are definitely out. "For this young team to progress and enhance themselves then Wednesday is important to them and if we can get through the tie you never know where it will take them."