Ghanaian Under-21 international Eugene Ofori has been given a further week's trial to try to persuade Joe Kinnear to offer him a permanent deal.
Ofori, who has won eight caps for his country at Under-21 level, is available to The Hatters boss on a free transfer should he impress.
Ofori is one of a number of players currently on trial at the club, with Belgium-based striker Soren Hermansen also trying to win a contract at Kenilworth Road.