Stoke City has promised to launch an internal investigation after a pig's head was placed in the locker of striker Kenwyne Jones on Friday. Jones reacted furiously at Stoke's Clayton Wood training ground, Press Association reported. The incident comes just two days before the club's final Premier League match of the season at Southampton. "The club takes seriously reports of an incident at our training ground this afternoon," the club said in a statement. "A full internal investigation will be carried out, and those responsible for any unacceptable behaviour will be dealt with in accordance with the club's disciplinary procedures." Stoke midfielder Brek Shea tweeted a picture of himself with the pig's head with the words "locker room banter gone wild."Michael Owen had his car covered in eggs and flour by teammates. Jones was also involved on that occasion, tweeting a picture of Owen's car to his followers with the explanation that it was a "leaving present" for the former England star. Speaking to BBC Radio 5 live this evening, Stoke manager Tony Pulis said he would speak to his players regarding Friday's events. "We have a smashing dressing room, and there are four or five lads who are always up to something. There is always banter going on," he said. "I honestly don't know what's gone on this morning; I've missed all of what's happened. I try to stay away from the home dressing room as much as I possibly can. I let the lads get on with it. "We will look at it tomorrow. I will have a chat with the lads and find out exactly what has happened. From that point onwards, we'll let everybody know exactly what the situation was." Information from Press Association was used in this report.