Head coach Arne Slot expects the improving form of Alexander Isak and Florian Wirtz to drive Liverpool forward in the future after seeing significant contributions recently. The two most expensive signings in the club’s history – costing a combined £241million – have had largely underwhelming first seasons due to Isak’s ongoing injury problems and Wirtz’s struggles adapting to the physicality of the Premier League. But the pair both scored in last weekend’s 3-1 win over Crystal Palace and look set to start their fourth successive match together at Manchester United on Sunday, which is their longest run of the campaign. Slot accepts the new arrivals have had their difficulties, not helped by an underperforming team around them, but in the last month has seen glimpses that both are finally starting to find their feet.…