The Ton assistant welcomed the squad back from their summer break yesterday with manager Allan Moore due to return from holiday later this week.
But while McNally, pictured, confirmed MacDonald's presence, he was keen to stress the club are no further forward in their quest to secure his signature.
He said: "We had some players down yesterday, and we'll also have a few more coming in later this week.
"Darren McGeouch was there - he's a boy who was here before that we're having a look at - and we had Archie Campbell, who played with Rangers, in too. Peter MacDonald is a player we're interested in, but there isn't anything significant in him training with us.
"We invited him in for training and we're pleased he decided to come. But he's keen to keep his options open at the moment, so I wouldn't want to get fans' hopes up by saying he's going to sign for us.
"He'll probably be in with us for the rest of the week and we will assess the situation on a day-by-day basis, but there's nothing to report at the moment."
McNally also confirmed the club had spoken to ex-Kilmarnock and Hamilton midfielder Gavin Skelton with a view to a possible move.
He said: "Gavin Skelton isn't training with us, but we've also spoken with him.
"His situation is similar to Peaso's in that he says he likes the sound of the set-up here and knows all about the club's fanbase and potential.
"But, like Peaso, he wants to think things over, and that's understandable as players have families and mortgages to think about. So we're waiting to hear back from Gavin, but we obviously won't wait forever."
Yesterday saw the club's first-team squad and a handful of youth team starlets put through their paces for the first time this summer.
And McNally says he was delighted with the fitness of the players upon their return.
He said: "We broke them in gently yesterday. We conducted our fitness tests in the morning, and we get the results of those tests today.
"The boys all returned in good condition and look as if they've looked after themselves and stuck to the training programmes, which is pleasing."