The preliminary squad for the England series began their conditioning on Wednesday morning.
The national team's Sri Lankan trainer, Mario Villavarayan, who went on a vacation, was supposed to return ahead of the camp. But a militant attack on a Gulshan restaurant earlier this month upset his schedule.
Local trainer Iftekharul Islam has taken the responsibility of supervising the Tigers' camp.
An instructor’s absence creates scope for slackness among the players but Mashrafe wants them to fully concentrate on their training, and not to worry about the trainer.
"It's true that we are not accustomed (to training) without Mario. He is with us for a long time. He has been given all the instructions," Mashrafe said.
"But all the players know their part. They know they have to do their own thing. It should not be that we will push ourselves only when Mario is here.
This is where Mashrafe sees a role for the seniors to inspire the youngsters in the team.
"The seniors have a role to play here. We have Mushfiqur [Rahim], [Mahmudullah] Riyad, Tamim [Iqbal]. The seniors who have made their way back - Shahriar Nafeez, Raqibul [Hasan] - are all fit.
"I think the youths can follow their guidelines."