Tabb played over 100 games for the Sky Blues before joining the Royals and has been impressed with their progress under Boothroyd ahead of the sides` meeting this weekend.
He said: "It will be nice to see a few faces on Saturday. They have had a very good start to the season and are up there in the top six.
"They are putting a nice little run together at the moment and the manager has got them playing in a good effective way so it will be a tough game for us.
"The lads I speak to say that the manager is doing well and you can see that in their results and where they are in the table.
"In previous years Coventry have had a good start but then fell away towards the end of the season, but from the signs so far it looks like they are up in the top six to stay."
Source: PA
Source: PA