JONJO Shelvey is expected to wear a cast against Saints this weekend – after breaking a finger in a training ground bust-up.

The Newcastle United midfielder fractured a finger bone after turning peacemaker during a heated exchange between Jamaal Lascelles and Mo Diame.

According to the Newcastle Journal, the punch up began when defender Jamaal Lascelles accused Diame of being ‘lazy’.

Shelvey, who has played three games since returning from a ban for his red card against Spurs on the season’s opening weekend, is being monitored ahead of Newcastle’s visit to St Mary’s on Saturday.

When asked about the Diame-Lascelles incident by Sky Sports on Saturday, Newcastle's Spanish forward Ayoze Perez played down the bust-up.

“I’m not going to comment anything about that. It is something that happens with every English team,” Perez insisted.

“We have a great dressing room, a great spirit and that is nothing important. We are not going to comment on that."

Shelvey, 25, has twice finished on the losing side at St Mary’s since scoring a late winner for Swansea City in February 2015.

Former Nottingham Forest defender Lascelles recently signed a new contract which keeps him at Newcastle until 2023.

Senegalese midfielder Mo Diame is in his second season with Newcastle following his move from Hull City 14 months ago.