The Premier League have opened an investigation into the transfer of Robert Snodgrass from West Ham United to West Bromwich Albion.

The midfielder was dropped by Baggies manager Sam Allardyce for the game against the Hammers, which his side lost 2-1.

And Allardyce revealed the clubs agreed Snodgrass would not face his former club after moving to the Hawthorns.

"That was an agreement between the clubs that this game he would not be allowed to play," Allardyce told BT Sport.

"We could only get the deal done with that agreement."

However, such agreements are against Premier League rules.

Rule I7 states: "No Club shall enter into a contract which enables any other party to that contract to acquire the ability materially to influence its policies or the performance of its teams in League Matches."

Sky Sports reports that an investigation will be opened into the matter.