Sunderland boss Steve Bruce admits he has been impressed by what he has seen from trialist Boudewijn Zenden.
The Dutch midfielder is currently training with the Black Cats as he searches for a new club.
The 33-year-old boasts considerable pedigree, having turned out for the likes of Barcelona, Chelsea, Liverpool and Marseille, and is not expected to be a free agent for long.
Sunderland have opted to take a look at his physical condition, with their lack of creative options concerning Bruce, and he could yet win a full-time deal on Wearside.
"I got a call from Bolo a little while ago and he said he was without a club so I invited him down to train," Bruce told the Sunderland Echo.
"He's had a great career at some huge clubs and when an opportunity comes to look at someone with that background then you take it.
"He looks in very good nick, considering he has not had a club. He has been training in Holland and has obviously looked after himself very well."
CoverBruce added: "One thing that does concern me slightly is that we're a little light on numbers.
"Bolo has played at the highest level and can cover a few positions.
"He'll work with us for a couple of weeks and we'll take it from there. I dare say I'll sit down and talk with him after our next game.
"At the moment, there is no commitment on either side. He's having a look at us and we're having a look at him. But certainly his past record shows he has the calibre that you need in the Premier League."