Van Gaal, who awarded Lahm the Bayern captaincy and who led the team to a Bundesliga and German Cup double, as well as taking them to the Champions League final in 2010, is painted as stubborn man whose inflexibility eventually led to his departure. Nonetheless, Lahm proved enthusiastic towards his former coach.
"He did a lot of good things here," he told the Daily Mail. He brought a more tactical approach. That’s stuck with the team. The tactics he introduced were very positive. We had problems with the number of goals we conceded, but we were successful."
While praising the Dutchman for his excellent tactical ingenuity, Lahm is quick to point out the struggles Bayern faced in a defensive capacity during his two year spell with the Munich outfit, and it's fair to say Manchester United have struggled with the same issue this season, conceding 10 goals in just seven league fixtures.
While the club's new-look Red Devil's frontline is easily capable of firing fours and fives, there’s a still a danger the back-four could concede one more. The addition of Radamel Falcao and Angel di Maria proved a masterstroke this summer, yet there can be no hiding the club's failure to reinforce at the back.
Nonetheless, after three games of the 2009-10 Bundesliga season under Van Gaal, Bayern were 14th and without a win. They drew with Hoffenheim and Werder Bremen in their first two games and then lost to Mainz. They won their next two games, the first of them against Wolfsburg, and were fifth in the table with eight points after five games.
They then beat Nuremberg and lost away to Hamburg on 26 September, dropping to seventh, but, from that point, the club did not lose again until 20 March, an incredible 19 games unbeaten, including 13 wins.
Few expect Van Gaal to deliver the league and Cup Double in his first season, as he did at Bayern, although a Champions League place is a necessity. If the Red Devils can continue to outscore their opponents, there's no reason to suggest he will not achieve just that.
The Dutch head coach may have encountered defensive problems during his time in Germany and now England, yet his ability to create effective, attacking sides could see him succeed in the Premier League.