Bent was close to returning at Manchester City but is expected to be fit for the Gunners' trip to Villa Park this weekend.
Lambert said: "There isn't an issue - at least not at my end there isn't. I have twenty-odd lads to look after.
"Goalscorers are the same, they thrive on scoring. The team is playing well and talking about Darren is deflecting from other guys who have come in and done really well."
Asked directly whether Bent had to prove his point at Bodymoor Heath, Lambert responded: "Everyone has to show their worth. I have no favourites. I judge them as equals. I'm trying to get the best out of them and I've got to do what it takes to get the best out of them."