Denmark international Christian Poulsen has admitted that he is struggling to make up his mind about his future.
The midfielder has been offered a new deal by Schalke but has also had offers from England, Italy and Spain.
The 25-year-old is being tipped for a switch to Villarreal but has still not decided where his future lies.
"There are many factors to consider, such as the desire to live and play in another country," Poulsen told BT.
"When you move to another club, you don't know exactly what you will get.
"We have a tough match schedule at Schalke 04, however, up to now I have been able to concentrate and produce good displays.
"There is a lot in my head and I will have to make a decision."