Napoli coach Walter Mazzarri denies Marek Hamsik has had his head turned by transfer speculation.

For defeat to Udinese, Hamsik gave away a goal with a howler, scored a screamer moments later and then saw his penalty saved.

"I really don't think the transfer rumours represent a problem for Marek," insisted Mazzarri after a 3-1 defeat in Udine.

The Slovak international has been repeatedly linked with a move to Manchester United.

"He is focused on Napoli and that is all. At times young lads like this can get hurt by criticism and pressure, but it was just a bad day for Marek.

"He continues to be a key figure for this team."