The Arsenal players were training on Saturday ahead of Sunday afternoon’s Premier League game against Bournemouth away from home.
Arsenal will head into the match against the Cherries at the Vitality Stadium on the back of a goalless draw with Southampton at the Emirates Stadium.
The Gunners are fourth in the Premier League table at the moment with 45 points from 24 matches, eight points behind leaders Leicester City, who have a game in hand.
Bielik is 18 years of age and can play as a defensive midfielder or as a central defender. The Poland Under-17 international joined Arsenal in January 2015 and is rated very highly by the North London outfit.
Bennacer is also 18 years of age and plays as a midfielder. The teenager has been on the books of the Gunners since 2015 and is also highly rated.