Leeds United lost 3-0 to Middlesbrough in their latest outing.
Leeds lost 3-0 to Boro yesterday, with individual errors costing them their chance of winning at the Riverside Stadium.
The match was actually a fairly even one, but an own-goal from Bellusci and a slip from Bamba resulted in two Middlesbrough goals in the contest, and Beagrie was critical of their performances.
"You have experienced players, with your two-centre backs and the goalkeeper, who has had a season littered with mistakes," he said. "You can see he doesn't have any confidence [on the second goal]. He should be so vocal for Bellusci to leave the ball. The two centre-backs played like strangers throughout."
Bellusci has rarely played for Leeds this season, with the Italian centre-back being overlooked in favour of Liam Cooper by Uwe Rosler.
Cooper has impressed, but his absence was keenly felt by Leeds at the weekend, with the side falling to just their second defeat of the season.
It was a disappointing way for the fixture to end, and if Bellusci and Bamba are partnered together again they will need to improve considerably.
Leeds' defeat to Middlesbrough sees them drop to 14th in the Championship table, and their next match comes against Birmingham City.