Mourinho has been keen to get rid of Martial following his decision to leave United's pre-season tour of the US to witness the birth of his son, Swan.
Javi Martinez headed home a second-half victor to give Bayern victory in a match they dominated.
"The other clubs that compete with us are really strong", Mourinho said, before his side were comprehensively dominated in a 1-0 defeat by Bayern Munich.
Boateng spent a season in the Premier League with United's neighbours Manchester City and Mourinho is rumoured to be in the market for a centre-half, amidst links with Barcelona's Yerry Mina. Or they are investing massively, like for example Liverpool, buying everything and everybody.
United have signed Shakhtar Donetsk midfielder Fred to fill the void left by the retired Michael Carrick, while young Porto right-back Diogo Dalot and Stoke City goalkeeper Lee Grant have also arrived as first-team back-up.
Pope declares death penalty ''inadmissible''
Most executions took place in China, Iran, Saudi Arabia, Iraq and Pakistan, in that order, it said in a report published in April. Pope Saint John Paul II and Pope Benedict both expressed opposition to the death penalty , but upheld what the Church taught .
The France international's future has been a source of relentless speculation over the past few months following a hard second season under Jose Mourinho.
United ended their preparations for the new season in uninspiring fashion, struggling to threaten Manuel Neuer's goal.
Jose Mourinho has once again lamented Manchester United's quiet transfer market, claiming the club will experience a "difficult season" if they don't sign more players.
Lindelof, Jones and Rashford did not travel to the United States while they took time off following the World Cup.
Central defence is an area the Portuguese is reportedly interested in strengthening, but it may be that Sunday's performance will emphasise a growing concern in the final third of the pitch.