Bolton twisted his knee on the weekend against Hawthorn and scans have revealed he has a slight medial ligament strain putting him in doubt for game on June 20.
Around about 7,500 DT coaches have Bolton ($268k) in their team and that injury news is a concern for them, especially considering the Swans play in the second-half of the always-tricky split round.
In other injury news from the SCG, $182k midfielder Jared Crouch seems to be over a knee knock and should be fit to take on the Pies, while veteran Leo Barry reportedly is a little behind schedule with his recovery from a pre-season knee injury with Swans coach Paul Roos admitting he wasn't sure when the $268k defender would be back.
Roos also revealed high-priced young forward Patrick Veszpremi could make his 2009 debut in Round 13 against Adelaide although the Swans coach said it was more likely he'd play the week after against the Kangas.