Megson departed at odds with a section of the fans and with the club in the relegation zone.
Evans insists there is not much that needs fixing and said: "I want to look forward - it is time to create unity.
"It is a time of change, a transitional period. Everyone has been placed in a position where we have to act in the best interests of the club.
"The interests of Bolton must prevail at all times. Players, staff, supporters and media need to unify so we can take the club forward.
"I look back to the reaction of the supporters at the start of the 2007/08 season with two or three thousands fans travelling to games.
"We created a 12th man. That team of 12 helped get us over the finishing line and beat the drop. The overwhelming message is for a united front. If we get that anything is possible.
"There are areas we still need to work on. It is a work in progress. We have a long way to go in the season."
Former Wolves Academy chief Evans and Wigley find themselves in charge with the transfer window opening.
A list of potential signings have been drawn up, although Evans admitted: "I would imagine things will have to be put on the back burner. But it would be good if we could freshen certain areas.
"Along with Gary and chief scout Colin Harvey we developed a comprehensive domestic and European recruitment network.
"We have targets in all areas but equally we have to be prudent and respectful of the fact that a new manager will be coming in. He will have his own ideas."
Wigley will pick the team against the lowly League Two side and could be tempted to freshen things up with a trip to Arsenal looming on Wednesday.
Midfielder Gavin McCann is pushing for a place in the starting line-up after recovering from an ankle injury.
Evans will make sure complacency does not set in against a side managed by former Celtic, Blackburn and Norwich striker Chris Sutton.
He said: "The FA Cup is held dear to all football people. It is not any different here.
"We will be professional in our approach and give Lincoln all the respect they deserve.
"It is our intention to go quietly about our business to make sure there is as little disruption as possible.
"We will be well prepared so we give ourselves every opportunity to make progress in the cup."
Next Permanent Bolton Manager. Click here to bet.