Brendan Rodgers strengthened Celtic with no less than seven signings this season as the Irishman looks to tackle domestic and European business. So far, the moves Rodgers has made have paid off as Celtic remain unbeaten in the Scottish Premiership and have recorded an impressive win in the Champions League over Slovan Bratislava. Whilst some players like Alex Valle and Auston Trusty are biding their time and settling into the club, Callum McGregor has said that one of Rodgers’ summer signings instantly blew him away from the first day he saw him. Arne Engels is a ‘real powerhouse’ at CelticMcG…