This season Semmy went to Crewe on loan and impressed Dario Grady who was hoping to sign the young defender on a permanent deal. However, Ostemobor decided to return to Anfield for one last chance of proving himself.
Semmy was converted to a right-sided midfielder on his return and has impressed in reserve games but seems unlikely to make the breakthrough and went up to Hearts at the weekend for a week's trial.
Hearts manager John Robertson said: "Jon was recommended to us and he is here for a few days so we can have a look at him. We also have a trialist keeper here this week and a couple of others over a few age groups."