Having signed four first-team squad members during the summer months, Celtic haven’t been completely inert when it comes to transfers. There’s been frustration for some supporters that business hasn’t been concluded as quickly as is optimal but the deals for Kasper Schmeichel, Viljami Sinisalo, Paulo Bernardo and Adam Idah have all been well received. Brendan Rodgers has also acknowledged that more work needs to be done. He wants his squad to be stronger than the options he had last season, especially in consideration of entry into an expanded Champions League. There could be a fair amount of …