Brendan Rodgers still has plenty of work to do in the transfer window as the Celtic boss looks to strengthen his squad for the season ahead. Competing in four competitions, Rodgers is keen to progress Celtic in Europe as well as continue dominating Scottish football. With the Champions League group stages starting next month, Celtic will look to add quality to his team to compete with the cream of Europe and it seems Rodgers has cast his eye towards the Serie A in a bid to strengthen before the transfer window closes this week. Celtic want Lazio winger Gustav IsaksenAccording to a report in La…