Google maps says its a 7 min car journey or a 36min walk.
It is too far to walk as Celtic park is in Parkhead which is at the other side of Glasgow it would be better to get a taxi, or public transport. The number 61 and 62 buses from argyle Street will get you there.
10 to 15 minute walk
Get an answer from Premier Inn Glasgow City Centre South Hotel staff and past guests.