The Lions are tracking Beavon, 28, after he scored 25 goals in 45 appearances for Wanderers last season, despite their relegation to League Two.
And Waddock has conceded artsandhealth.ie/topamax/ that his side, who return for pre-season training this morning, may lose Beavon this summer.
He told the Buckinghamshire Advertiser yesterday: "He’ll be wearing a training kit tomorrow. I can only guarantee today and tomorrow.
"Beyond that I don’t know. He’s under contract and he’ll report back."