The 24-year-old has found himself under scrutiny following a difficult run of results and individual performances, with United dropping to 18th in the Premier League after winning only one of their opening 10 matches.
The criticism intensified after the 4-4 draw with Aston Villa, when Lammens was questioned over his involvement in the goals conceded by his side. Former United captain Roy Keane was among those to voice concerns, saying the goalkeeper needed to do better and had cost the club points in recent weeks.
Lammens has attempted to shut out the criticism, although he acknowledged that the situation at Old Trafford has made that increasingly difficult.
“I try to remain stoic. I avoid as much as possible everything that is said and written, but given the situation Manchester United is in, that is not always easy,” he said.
“They have been difficult weeks. I won’t lie. Keeping a distance and putting things into perspective is not always easy.
“Am I happy that I could show myself to England? I am mainly happy that I could show myself to Belgium.”
The international break has provided some relief for the goalkeeper, who started Belgium’s 2-1 Nations League victory over Turkey on Thursday.
Lammens played his part in the win, which was secured by goals from Kevin De Bruyne and Charles De Ketelaere after Arda Güler had given Turkey an early lead.
His return to the national team comes at a particularly unsettled moment for United. Michael Carrick was dismissed after the club’s poor start, with Mauricio Pochettino appointed as his successor.
The change in management means Lammens will return to a different environment when the international break concludes. United face Liverpool at Anfield on November 22, giving the new head coach an immediate challenge.
Before that, Belgium meet Italy in their final Nations League group fixture on Sunday. Lammens will be hoping to carry his international form into the next stage of United’s season, with the scrutiny on his performances unlikely to ease until results improve.