Crewe Alexandra's top scorer Clayton Donaldson has thanked manager Dario Gradi for his emergence as a top League Two striker this season.The 26-year-old has notched eight goals in eight games and is the joint-second top scorer in the division with 13. [LNB]The former Hibernian and York City man told BBC Radio Stoke: "Dario has been terrific with me. He never lets you settle. I've learned a lot." [LNB]Donaldson is set to leave in the summer when his contract at Crewe expires. [LNB]He was signed by ex-boss Steve Holland for around £200,000 from Hibernian in 2008 but managed just seven goals in his first season. [LNB]He hit 13 goals last term, and his double against Wycombe took him to 14 in all competitions at this campaign's halfway point. [LNB]He said: "It is good to work with someone who is so experienced and who can help you go far.[LNB] I am hoping nothing happens between now and the summer, but you never know Dario Gradi on Clayton Donaldson's future "My recent form is all down to him to be honest. He's been at me all season because he can see my potential. There have been times when we have gone through things in training, and then the game comes and I've done the total opposite. [LNB]"It's just getting things drilled in my head to help me make the right decisions. The more he pushes me the better it will be for me and the team. [LNB]"In football everyone wants a goal-scorer. When you are doing well you hear of people being interested. [LNB]"Any player will tell you they want to play as high as possible, but I won't think about that now. I'm a Crewe player and I'm focused on my job. It's a good time to be at Crewe Alexandra." [LNB]Gradi said: "In one way you worry but in another you are pleased because it would bring much-needed finances to the club - we've had no cup run this year - also for the player if a big club came in. [LNB]"It would be another success story. But I am hoping nothing happens between now and the summer, but you never know. We are not trying to sell him - I'd rather keep him to help us with our push for a promotion place."