Alex Woodyard was the first signing last year, on 11 June.
No need to be concerned at all. There are eight other League Two clubs yet to make a signing - Barnet, Carlisle, Colchester, Exeter, Morecambe, Swindon, Wycombe and Yeovil - and several others have made only one. There was a flurry of activity in May from Coventry, Cambridge, Chesterfield and especially Mansfield, but the rest have done very little between them. There is absolutely no movement in L2 at all at the moment, it is very quiet.
The longer that persists, the more anxious (i.e. desperate and far more sensible) the agents will become. The majority of lower division clubs refuse to play their silly games, as the likes of Darragh MacAnthony have stated.