To a vast number of Newcastle fans, Chancel Mbemba is without doubt the club's finest centre-half. But he suddenly has competition from within the ranks.
Newcastle comfortably beat Brentford 3-1 at St. James' Park.
The defender has been a victim of the rotation policy at Newcastle United.
The pair, both playing their club football in the Championship, kept a clean sheet, but Cascarino is still concerned.
The former Aston Villa defender has impressed Newcastle manager Rafael Benitez since joining the club.
Rafael Benitez was busy in the transfer market over the summer, but how have his new additions settled in?
Ciaran Clark joined Newcastle United from Championship rivals Aston Villa in the summer transfer window.
Newcastle United's Ciaran Clark is one of the top rated defenders in the Championship.
Newcastle United extended their winning run as they beat Rotherham by a single goal at the weekend.
Rafa Benitez has already used 27 different players in his Newcastle United team so far this season and Clark believes it will bring out the best in the squad.
The 26-year-old centre-back proved decidedly error-prone during his time at Aston Villa, but the form he showcased two seasons ago offers reason for optimism.
The Republic of Ireland international left Villa this week and has joined Rafa Benitez's Newcastle United revolution.
Newcastle have reportedly activated Ciaran Clark's release clause.