The defender was also full of praise for Santi Cazorla as he continues to impress in central midfield.
Coquelin returned to the Gunners last season from a loan spell and proved an instant success, with his defensive midfield nous having given the side the balance they have been missing for several years.
Bellerin had a similar breakthrough season, coming in to the side in the place of injured summer signing Mathieu Debuchy and demonstrating his abilities in a number of impressive performances across the season.
And Mertesacker has praised them, saying there’s a lot more to come from them this season.
“Last season we had Hector Bellerin stepping up and Francis Coquelin in the second half of the season,” he told Arsenal.com.
“These are two young players who got their chance to step up and performed really well. It gave us a lot of energy when it was needed, there’s a lot more to come from them this season.”
Full of praise for Santi Cazorla
The German defender was also full of praise for Santi Cazorla following his impressive performances last season.
The Spaniard recently signed a new deal at the Emirates after starring in the side last year, with Arsene Wenger having employed him in a deeper midfield role rather than the position on the wings he has operated in previously.
And Mertesacker says he stands out every year, labeling his skills with the ball as absolutely amazing.
“He [Cazorla] stands out every year, but he already set such a high standard when he first arrived,” he added.
“He played more on the wing when he first arrived and now he’s more central, sitting and creating the chances from even deeper. He’s controlling the game and his skills with the ball is absolutely amazing to watch, but to play alongside him is even better.”